| 1 | ## oils_failures_allowed: 0
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| 2 | ## compare_shells: bash-4.4 zsh
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| 3 |
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| 4 | #
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| 5 | # Only bash and zsh seem to implement [[ foo =~ '' ]]
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| 6 | #
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| 7 | # ^(a b)$ is a regex that should match 'a b' in a group.
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| 8 | #
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| 9 | # Not sure what bash is doing here... I think I have to just be empirical.
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| 10 | # Might need "compat" switch for parsing the regex. It should be an opaque
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| 11 | # string like zsh, not sure why it isn't.
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| 12 | #
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| 13 | # I think this is just papering over bugs...
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| 14 | # https://www.gnu.org/software/bash/manual/bash.html#Conditional-Constructs
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| 15 | #
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| 16 | # Storing the regular expression in a shell variable is often a useful way to
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| 17 | # avoid problems with quoting characters that are special to the shell. It is
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| 18 | # sometimes difficult to specify a regular expression literally without using
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| 19 | # quotes, or to keep track of the quoting used by regular expressions while
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| 20 | # paying attention to the shell’s quote removal. Using a shell variable to
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| 21 | # store the pattern decreases these problems. For example, the following is
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| 22 | # equivalent to the above:
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| 23 | #
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| 24 | # pattern='[[:space:]]*(a)?b'
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| 25 | # [[ $line =~ $pattern ]]
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| 26 | #
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| 27 | # If you want to match a character that’s special to the regular expression
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| 28 | # grammar, it has to be quoted to remove its special meaning. This means that in
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| 29 | # the pattern ‘xxx.txt’, the ‘.’ matches any character in the string (its usual
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| 30 | # regular expression meaning), but in the pattern ‘"xxx.txt"’ it can only match a
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| 31 | # literal ‘.’. Shell programmers should take special care with backslashes, since
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| 32 | # backslashes are used both by the shell and regular expressions to remove the
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| 33 | # special meaning from the following character. The following two sets of
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| 34 | # commands are not equivalent:
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| 35 | #
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| 36 | # From bash code: ( | ) are treated special. Normally they must be quoted, but
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| 37 | # they can be UNQUOTED in BASH_REGEX state. In fact they can't be quoted!
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| 38 |
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| 39 | #### BASH_REMATCH
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| 40 | [[ foo123 =~ ([a-z]+)([0-9]+) ]]
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| 41 | echo status=$?
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| 42 | argv.py "${BASH_REMATCH[@]}"
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| 43 |
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| 44 | [[ failed =~ ([a-z]+)([0-9]+) ]]
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| 45 | echo status=$?
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| 46 | argv.py "${BASH_REMATCH[@]}" # not cleared!
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| 47 |
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| 48 | ## STDOUT:
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| 49 | status=0
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| 50 | ['foo123', 'foo', '123']
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| 51 | status=1
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| 52 | []
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| 53 | ## END
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| 54 | ## N-I zsh STDOUT:
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| 55 | status=0
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| 56 | ['']
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| 57 | status=1
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| 58 | ['']
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| 59 | ## END
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| 60 |
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| 61 | #### Match is unanchored at both ends
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| 62 | [[ 'bar' =~ a ]] && echo true
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| 63 | ## stdout: true
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| 64 |
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| 65 | #### Failed match
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| 66 | [[ 'bar' =~ X ]] && echo true
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| 67 | ## status: 1
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| 68 | ## stdout-json: ""
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| 69 |
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| 70 | #### Regex quoted with \ -- preferred in bash
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| 71 | [[ 'a b' =~ ^(a\ b)$ ]] && echo true
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| 72 | ## stdout: true
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| 73 |
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| 74 | #### Regex quoted with single quotes
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| 75 | # bash doesn't like the quotes
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| 76 | [[ 'a b' =~ '^(a b)$' ]] && echo true
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| 77 | ## stdout-json: ""
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| 78 | ## status: 1
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| 79 | ## OK zsh stdout: true
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| 80 | ## OK zsh status: 0
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| 81 |
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| 82 | #### Regex quoted with double quotes
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| 83 | # bash doesn't like the quotes
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| 84 | [[ 'a b' =~ "^(a b)$" ]] && echo true
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| 85 | ## stdout-json: ""
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| 86 | ## status: 1
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| 87 | ## OK zsh stdout: true
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| 88 | ## OK zsh status: 0
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| 89 |
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| 90 | #### Fix single quotes by storing in variable
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| 91 | pat='^(a b)$'
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| 92 | [[ 'a b' =~ $pat ]] && echo true
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| 93 | ## stdout: true
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| 94 |
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| 95 | #### Fix single quotes by storing in variable
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| 96 | pat="^(a b)$"
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| 97 | [[ 'a b' =~ $pat ]] && echo true
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| 98 | ## stdout: true
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| 99 |
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| 100 | #### Double quoting pat variable -- again bash doesn't like it.
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| 101 | pat="^(a b)$"
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| 102 | [[ 'a b' =~ "$pat" ]] && echo true
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| 103 | ## stdout-json: ""
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| 104 | ## status: 1
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| 105 | ## OK zsh stdout: true
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| 106 | ## OK zsh status: 0
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| 107 |
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| 108 | #### Mixing quoted and unquoted parts
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| 109 | [[ 'a b' =~ 'a 'b ]] && echo true
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| 110 | [[ "a b" =~ "a "'b' ]] && echo true
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| 111 | ## STDOUT:
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| 112 | true
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| 113 | true
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| 114 | ## END
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| 115 |
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| 116 | #### Regex with == and not =~ is parse error, different lexer mode required
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| 117 | # They both give a syntax error. This is lame.
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| 118 | [[ '^(a b)$' == ^(a\ b)$ ]] && echo true
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| 119 | ## status: 2
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| 120 | ## OK zsh status: 1
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| 121 |
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| 122 | #### Omitting ( )
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| 123 | [[ '^a b$' == ^a\ b$ ]] && echo true
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| 124 | ## stdout: true
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| 125 |
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| 126 | #### Malformed regex
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| 127 | # Are they trying to PARSE the regex? Do they feed the buffer directly to
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| 128 | # regcomp()?
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| 129 | [[ 'a b' =~ ^)a\ b($ ]] && echo true
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| 130 | ## stdout-json: ""
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| 131 | ## status: 2
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| 132 | ## OK zsh status: 1
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| 133 |
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| 134 | #### Regex with |
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| 135 | [[ 'bar' =~ foo|bar ]] && echo true
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| 136 | ## stdout: true
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| 137 | ## N-I zsh stdout-json: ""
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| 138 | ## N-I zsh status: 1
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| 139 |
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| 140 | #### Regex to match literal brackets []
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| 141 |
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| 142 | # bash-completion relies on this, so we're making it match bash.
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| 143 | # zsh understandably differs.
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| 144 | [[ '[]' =~ \[\] ]] && echo true
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| 145 |
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| 146 | # Another way to write this.
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| 147 | pat='\[\]'
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| 148 | [[ '[]' =~ $pat ]] && echo true
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| 149 | ## STDOUT:
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| 150 | true
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| 151 | true
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| 152 | ## END
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| 153 | ## OK zsh STDOUT:
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| 154 | true
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| 155 | ## END
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| 156 |
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| 157 | #### Regex to match literals . ^ $ etc.
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| 158 | [[ 'x' =~ \. ]] || echo false
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| 159 | [[ '.' =~ \. ]] && echo true
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| 160 |
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| 161 | [[ 'xx' =~ \^\$ ]] || echo false
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| 162 | [[ '^$' =~ \^\$ ]] && echo true
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| 163 |
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| 164 | [[ 'xxx' =~ \+\*\? ]] || echo false
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| 165 | [[ '*+?' =~ \*\+\? ]] && echo true
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| 166 |
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| 167 | [[ 'xx' =~ \{\} ]] || echo false
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| 168 | [[ '{}' =~ \{\} ]] && echo true
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| 169 | ## STDOUT:
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| 170 | false
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| 171 | true
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| 172 | false
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| 173 | true
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| 174 | false
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| 175 | true
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| 176 | false
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| 177 | true
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| 178 | ## END
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| 179 | ## BUG zsh STDOUT:
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| 180 | true
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| 181 | false
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| 182 | false
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| 183 | false
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| 184 | ## END
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| 185 | ## BUG zsh status: 1
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| 186 |
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| 187 | #### Unquoted { is a regex parse error
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| 188 | [[ { =~ { ]] && echo true
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| 189 | echo status=$?
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| 190 | ## stdout-json: ""
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| 191 | ## status: 2
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| 192 | ## BUG bash stdout-json: "status=2\n"
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| 193 | ## BUG bash status: 0
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| 194 | ## BUG zsh stdout-json: "status=1\n"
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| 195 | ## BUG zsh status: 0
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| 196 |
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| 197 | #### Fatal error inside [[ =~ ]]
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| 198 |
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| 199 | # zsh and osh are stricter than bash. bash treats [[ like a command.
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| 200 |
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| 201 | [[ a =~ $(( 1 / 0 )) ]]
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| 202 | echo status=$?
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| 203 | ## stdout-json: ""
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| 204 | ## status: 1
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| 205 | ## BUG bash stdout: status=1
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| 206 | ## BUG bash status: 0
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| 207 |
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| 208 | #### Quoted { and +
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| 209 | [[ { =~ "{" ]] && echo 'yes {'
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| 210 | [[ + =~ "+" ]] && echo 'yes +'
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| 211 | [[ * =~ "*" ]] && echo 'yes *'
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| 212 | [[ ? =~ "?" ]] && echo 'yes ?'
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| 213 | [[ ^ =~ "^" ]] && echo 'yes ^'
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| 214 | [[ $ =~ "$" ]] && echo 'yes $'
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| 215 | [[ '(' =~ '(' ]] && echo 'yes ('
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| 216 | [[ ')' =~ ')' ]] && echo 'yes )'
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| 217 | [[ '|' =~ '|' ]] && echo 'yes |'
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| 218 | [[ '\' =~ '\' ]] && echo 'yes \'
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| 219 | echo ---
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| 220 |
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| 221 | [[ . =~ "." ]] && echo 'yes .'
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| 222 | [[ z =~ "." ]] || echo 'no .'
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| 223 | echo ---
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| 224 |
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| 225 | # This rule is weird but all shells agree. I would expect that the - gets
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| 226 | # escaped? It's an operator? but it behaves like a-z.
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| 227 | [[ a =~ ["a-z"] ]]; echo "a $?"
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| 228 | [[ - =~ ["a-z"] ]]; echo "- $?"
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| 229 | [[ b =~ ['a-z'] ]]; echo "b $?"
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| 230 | [[ z =~ ['a-z'] ]]; echo "z $?"
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| 231 |
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| 232 | echo status=$?
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| 233 | ## STDOUT:
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| 234 | yes {
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| 235 | yes +
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| 236 | yes *
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| 237 | yes ?
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| 238 | yes ^
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| 239 | yes $
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| 240 | yes (
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| 241 | yes )
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| 242 | yes |
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| 243 | yes \
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| 244 | ---
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| 245 | yes .
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| 246 | no .
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| 247 | ---
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| 248 | a 0
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| 249 | - 1
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| 250 | b 0
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| 251 | z 0
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| 252 | status=0
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| 253 | ## END
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| 254 | ## N-I zsh STDOUT:
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| 255 | yes ^
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| 256 | yes $
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| 257 | yes )
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| 258 | yes |
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| 259 | ---
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| 260 | yes .
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| 261 | ---
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| 262 | a 0
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| 263 | - 1
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| 264 | b 0
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| 265 | z 0
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| 266 | status=0
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| 267 | ## END
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| 268 |
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| 269 | #### Escaped {
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| 270 | # from bash-completion
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| 271 | [[ '$PA' =~ ^(\$\{?)([A-Za-z0-9_]*)$ ]] && argv.py "${BASH_REMATCH[@]}"
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| 272 | ## STDOUT:
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| 273 | ['$PA', '$', 'PA']
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| 274 | ## END
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| 275 | ## BUG zsh stdout-json: ""
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| 276 | ## BUG zsh status: 1
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| 277 |
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| 278 | #### Escaped { stored in variable first
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| 279 | # from bash-completion
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| 280 | pat='^(\$\{?)([A-Za-z0-9_]*)$'
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| 281 | [[ '$PA' =~ $pat ]] && argv.py "${BASH_REMATCH[@]}"
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| 282 | ## STDOUT:
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| 283 | ['$PA', '$', 'PA']
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| 284 | ## END
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| 285 | ## BUG zsh STDOUT:
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| 286 | ['']
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| 287 | ## END
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| 288 |
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| 289 | #### regex with ?
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| 290 | [[ 'c' =~ c? ]] && echo true
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| 291 | [[ '' =~ c? ]] && echo true
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| 292 | ## STDOUT:
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| 293 | true
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| 294 | true
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| 295 | ## END
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| 296 |
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| 297 | #### regex with unprintable characters
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| 298 | # can't have nul byte
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| 299 |
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| 300 | # This pattern has literal characters
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| 301 | pat=$'^[\x01\x02]+$'
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| 302 |
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| 303 | [[ $'\x01\x02\x01' =~ $pat ]]; echo status=$?
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| 304 | [[ $'a\x01' =~ $pat ]]; echo status=$?
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| 305 |
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| 306 | # NOTE: There doesn't appear to be any way to escape these!
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| 307 | pat2='^[\x01\x02]+$'
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| 308 |
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| 309 | ## STDOUT:
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| 310 | status=0
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| 311 | status=1
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| 312 | ## END
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| 313 |
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| 314 | #### pattern $f(x) -- regression
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| 315 | f=fff
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| 316 | [[ fffx =~ $f(x) ]]
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| 317 | echo status=$?
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| 318 | [[ ffx =~ $f(x) ]]
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| 319 | echo status=$?
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| 320 | ## STDOUT:
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| 321 | status=0
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| 322 | status=1
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| 323 | ## END
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| 324 |
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| 325 | #### pattern a=(1)
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| 326 | [[ a=x =~ a=(x) ]]
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| 327 | echo status=$?
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| 328 | [[ =x =~ a=(x) ]]
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| 329 | echo status=$?
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| 330 | ## STDOUT:
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| 331 | status=0
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| 332 | status=1
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| 333 | ## END
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| 334 | ## BUG zsh status: 1
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| 335 | ## BUG zsh STDOUT:
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| 336 | status=0
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| 337 | ## END
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| 338 |
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| 339 | #### pattern @f(x)
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| 340 | shopt -s parse_at
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| 341 | [[ @fx =~ @f(x) ]]
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| 342 | echo status=$?
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| 343 | [[ fx =~ @f(x) ]]
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| 344 | echo status=$?
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| 345 | ## STDOUT:
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| 346 | status=0
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| 347 | status=1
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| 348 | ## END
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| 349 |
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| 350 |
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| 351 | #### Bug: Nix idiom with closing ) next to pattern
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| 352 |
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| 353 | if [[ ! (" ${params[*]} " =~ " -shared " || " ${params[*]} " =~ " -static ") ]]; then
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| 354 | echo one
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| 355 | fi
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| 356 |
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| 357 | # Reduced idiom
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| 358 | if [[ (foo =~ foo) ]]; then
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| 359 | echo two
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| 360 | fi
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| 361 |
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| 362 | ## STDOUT:
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| 363 | one
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| 364 | two
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| 365 | ## END
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| 366 |
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| 367 | #### unquoted (a b) as pattern, (a b|c)
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| 368 |
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| 369 | if [[ 'a b' =~ (a b) ]]; then
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| 370 | echo one
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| 371 | fi
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| 372 |
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| 373 | if [[ 'a b' =~ (a b) ]]; then
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| 374 | echo BAD
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| 375 | fi
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| 376 |
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| 377 | if [[ 'a b' =~ (a b|c) ]]; then
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| 378 | echo two
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| 379 | fi
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| 380 |
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| 381 | # I think spaces are only allowed within ()
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| 382 |
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| 383 | if [[ ' c' =~ (a| c) ]]; then
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| 384 | echo three
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| 385 | fi
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| 386 |
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| 387 | ## STDOUT:
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| 388 | one
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| 389 | two
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| 390 | three
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| 391 | ## END
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| 392 |
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| 393 | #### Multiple adjacent () groups
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| 394 |
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| 395 | if [[ 'a-b-c-d' =~ a-(b| >>)-c-( ;|[de])|ff|gg ]]; then
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| 396 | argv.py "${BASH_REMATCH[@]}"
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| 397 | fi
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| 398 |
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| 399 | if [[ ff =~ a-(b| >>)-c-( ;|[de])|ff|gg ]]; then
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| 400 | argv.py "${BASH_REMATCH[@]}"
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| 401 | fi
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| 402 |
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| 403 | # empty group ()
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| 404 |
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| 405 | if [[ zz =~ ([a-z]+)() ]]; then
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| 406 | argv.py "${BASH_REMATCH[@]}"
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| 407 | fi
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| 408 |
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| 409 | # nested empty group
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| 410 | if [[ zz =~ ([a-z]+)(()z) ]]; then
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| 411 | argv.py "${BASH_REMATCH[@]}"
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| 412 | fi
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| 413 |
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| 414 | ## STDOUT:
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| 415 | ['a-b-c-d', 'b', 'd']
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| 416 | ['ff', '', '']
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| 417 | ['zz', 'zz', '']
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| 418 | ['zz', 'z', 'z', '']
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| 419 | ## END
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| 420 |
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| 421 | ## BUG zsh status: 1
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| 422 | ## BUG zsh STDOUT:
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| 423 | ['']
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| 424 | ['']
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| 425 | ['']
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| 426 | ['']
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| 427 | ## END
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| 428 |
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| 429 | #### unquoted [a b] as pattern, [a b|c]
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| 430 |
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| 431 | $SH <<'EOF'
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| 432 | [[ a =~ [ab] ]] && echo yes
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| 433 | EOF
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| 434 | echo "[ab]=$?"
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| 435 |
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| 436 | $SH <<'EOF'
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| 437 | [[ a =~ [a b] ]] && echo yes
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| 438 | EOF
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| 439 | echo "[a b]=$?"
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| 440 |
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| 441 | $SH <<'EOF'
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| 442 | [[ a =~ ([a b]) ]] && echo yes
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| 443 | EOF
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| 444 | echo "[a b]=$?"
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| 445 |
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| 446 | ## STDOUT:
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| 447 | yes
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| 448 | [ab]=0
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| 449 | [a b]=2
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| 450 | yes
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| 451 | [a b]=0
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| 452 | ## END
|
| 453 |
|
| 454 | ## OK zsh STDOUT:
|
| 455 | yes
|
| 456 | [ab]=0
|
| 457 | [a b]=1
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| 458 | yes
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| 459 | [a b]=0
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| 460 | ## END
|
| 461 |
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| 462 | #### c|a unquoted
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| 463 |
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| 464 | if [[ a =~ c|a ]]; then
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| 465 | echo one
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| 466 | fi
|
| 467 |
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| 468 | ## STDOUT:
|
| 469 | one
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| 470 | ## END
|
| 471 | ## N-I zsh status: 1
|
| 472 |
|
| 473 | #### Operator chars ; & but not |
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| 474 |
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| 475 | # Hm semicolon is still an operator in bash
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| 476 | $SH <<'EOF'
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| 477 | [[ ';' =~ ; ]] && echo semi
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| 478 | EOF
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| 479 | echo semi=$?
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| 480 |
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| 481 | $SH <<'EOF'
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| 482 | [[ ';' =~ (;) ]] && echo semi paren
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| 483 | EOF
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| 484 | echo semi paren=$?
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| 485 |
|
| 486 | echo
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| 487 |
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| 488 | $SH <<'EOF'
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| 489 | [[ '&' =~ & ]] && echo amp
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| 490 | EOF
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| 491 | echo amp=$?
|
| 492 |
|
| 493 | # Oh I guess this is not a bug? regcomp doesn't reject this trivial regex?
|
| 494 | $SH <<'EOF'
|
| 495 | [[ '|' =~ | ]] && echo pipe1
|
| 496 | [[ 'a' =~ | ]] && echo pipe2
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| 497 | EOF
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| 498 | echo pipe=$?
|
| 499 |
|
| 500 | $SH <<'EOF'
|
| 501 | [[ '|' =~ a| ]] && echo four
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| 502 | EOF
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| 503 | echo pipe=$?
|
| 504 |
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| 505 | # This is probably special because > operator is inside foo [[ a > b ]]
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| 506 | $SH <<'EOF'
|
| 507 | [[ '<>' =~ <> ]] && echo angle
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| 508 | EOF
|
| 509 | echo angle=$?
|
| 510 |
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| 511 | # Bug: OSH allowed this!
|
| 512 | $SH <<'EOF'
|
| 513 | [[ $'a\nb' =~ a
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| 514 | b ]] && echo newline
|
| 515 | EOF
|
| 516 | echo newline=$?
|
| 517 |
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| 518 | ## STDOUT:
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| 519 | semi=2
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| 520 | semi paren
|
| 521 | semi paren=0
|
| 522 |
|
| 523 | amp=2
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| 524 | pipe1
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| 525 | pipe2
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| 526 | pipe=0
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| 527 | four
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| 528 | pipe=0
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| 529 | angle=2
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| 530 | newline=2
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| 531 | ## END
|
| 532 |
|
| 533 | ## BUG zsh STDOUT:
|
| 534 | semi=1
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| 535 | semi paren=1
|
| 536 |
|
| 537 | amp=1
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| 538 | pipe=1
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| 539 | pipe=1
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| 540 | angle=1
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| 541 | newline=1
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| 542 | ## END
|
| 543 |
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| 544 |
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| 545 |
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| 546 | #### Quotes '' "" $'' $"" in pattern
|
| 547 |
|
| 548 | $SH <<'EOF'
|
| 549 | [[ '|' =~ '|' ]] && echo sq
|
| 550 | EOF
|
| 551 | echo sq=$?
|
| 552 |
|
| 553 | $SH <<'EOF'
|
| 554 | [[ '|' =~ "|" ]] && echo dq
|
| 555 | EOF
|
| 556 | echo dq=$?
|
| 557 |
|
| 558 | $SH <<'EOF'
|
| 559 | [[ '|' =~ $'|' ]] && echo dollar-sq
|
| 560 | EOF
|
| 561 | echo dollar-sq=$?
|
| 562 |
|
| 563 | $SH <<'EOF'
|
| 564 | [[ '|' =~ $"|" ]] && echo dollar-dq
|
| 565 | EOF
|
| 566 | echo dollar-dq=$?
|
| 567 |
|
| 568 | ## STDOUT:
|
| 569 | sq
|
| 570 | sq=0
|
| 571 | dq
|
| 572 | dq=0
|
| 573 | dollar-sq
|
| 574 | dollar-sq=0
|
| 575 | dollar-dq
|
| 576 | dollar-dq=0
|
| 577 | ## END
|
| 578 |
|
| 579 |
|
| 580 | #### Unicode in pattern
|
| 581 |
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| 582 | $SH <<'EOF'
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| 583 | [[ μ =~ μ ]] && echo mu
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| 584 | EOF
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| 585 | echo mu=$?
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| 586 |
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| 587 | ## STDOUT:
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| 588 | mu
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| 589 | mu=0
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| 590 | ## END
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| 591 |
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| 592 | #### Parse error with 2 words
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| 593 |
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| 594 | if [[ a =~ c a ]]; then
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| 595 | echo one
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| 596 | fi
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| 597 |
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| 598 | ## status: 2
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| 599 | ## STDOUT:
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| 600 | ## END
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| 601 |
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| 602 | ## BUG zsh status: 1
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| 603 | ## BUG zsh STDOUT:
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| 604 | one
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| 605 | ## END
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| 606 |
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| 607 | #### make a lisp example
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| 608 |
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| 609 | str='(hi)'
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| 610 | [[ "${str}" =~ ^^([][{}\(\)^@])|^(~@)|(\"(\\.|[^\\\"])*\")|^(;[^$'\n']*)|^([~\'\`])|^([^][ ~\`\'\";{}\(\)^@\,]+)|^[,]|^[[:space:]]+ ]]
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| 611 | echo status=$?
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| 612 |
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| 613 | m=${BASH_REMATCH[0]}
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| 614 | echo m=$m
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| 615 |
|
| 616 | ## STDOUT:
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| 617 | status=0
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| 618 | m=(
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| 619 | ## END
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| 620 |
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| 621 | ## BUG zsh STDOUT:
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| 622 | status=1
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| 623 | m=
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| 624 | ## END
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| 625 |
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| 626 | #### Operators and space lose meaning inside ()
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| 627 | [[ '< >' =~ (< >) ]] && echo true
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| 628 | ## stdout: true
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| 629 | ## N-I zsh stdout-json: ""
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| 630 | ## N-I zsh status: 1
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| 631 |
|