| 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:
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| 193 | status=2
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| 194 | ## END
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| 195 | ## BUG bash status: 0
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| 196 | ## BUG zsh STDOUT:
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| 197 | status=1
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| 198 | ## END
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| 199 | ## BUG zsh status: 0
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| 200 |
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| 201 | #### Fatal error inside [[ =~ ]]
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| 202 |
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| 203 | # zsh and osh are stricter than bash. bash treats [[ like a command.
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| 204 |
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| 205 | [[ a =~ $(( 1 / 0 )) ]]
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| 206 | echo status=$?
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| 207 | ## stdout-json: ""
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| 208 | ## status: 1
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| 209 | ## BUG bash stdout: status=1
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| 210 | ## BUG bash status: 0
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| 211 |
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| 212 | #### Quoted { and +
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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 'yes ('
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| 220 | [[ ')' =~ ')' ]] && echo 'yes )'
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| 221 | [[ '|' =~ '|' ]] && echo 'yes |'
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| 222 | [[ '\' =~ '\' ]] && echo 'yes \'
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| 223 | echo ---
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| 224 |
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| 225 | [[ . =~ "." ]] && echo 'yes .'
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| 226 | [[ z =~ "." ]] || echo 'no .'
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| 227 | echo ---
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| 228 |
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| 229 | # This rule is weird but all shells agree. I would expect that the - gets
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| 230 | # escaped? It's an operator? but it behaves like a-z.
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| 231 | [[ a =~ ["a-z"] ]]; echo "a $?"
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| 232 | [[ - =~ ["a-z"] ]]; echo "- $?"
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| 233 | [[ b =~ ['a-z'] ]]; echo "b $?"
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| 234 | [[ z =~ ['a-z'] ]]; echo "z $?"
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| 235 |
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| 236 | echo status=$?
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| 237 | ## STDOUT:
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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 | yes (
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| 245 | yes )
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| 246 | yes |
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| 247 | yes \
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| 248 | ---
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| 249 | yes .
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| 250 | no .
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| 251 | ---
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| 252 | a 0
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| 253 | - 1
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| 254 | b 0
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| 255 | z 0
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| 256 | status=0
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| 257 | ## END
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| 258 | ## N-I zsh STDOUT:
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| 259 | yes ^
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| 260 | yes $
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| 261 | yes )
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| 262 | yes |
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| 263 | ---
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| 264 | yes .
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| 265 | ---
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| 266 | a 0
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| 267 | - 1
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| 268 | b 0
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| 269 | z 0
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| 270 | status=0
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| 271 | ## END
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| 272 |
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| 273 | #### Escaped {
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| 274 | # from bash-completion
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| 275 | [[ '$PA' =~ ^(\$\{?)([A-Za-z0-9_]*)$ ]] && argv.py "${BASH_REMATCH[@]}"
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| 276 | ## STDOUT:
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| 277 | ['$PA', '$', 'PA']
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| 278 | ## END
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| 279 | ## BUG zsh stdout-json: ""
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| 280 | ## BUG zsh status: 1
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| 281 |
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| 282 | #### Escaped { stored in variable first
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| 283 | # from bash-completion
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| 284 | pat='^(\$\{?)([A-Za-z0-9_]*)$'
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| 285 | [[ '$PA' =~ $pat ]] && argv.py "${BASH_REMATCH[@]}"
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| 286 | ## STDOUT:
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| 287 | ['$PA', '$', 'PA']
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| 288 | ## END
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| 289 | ## BUG zsh STDOUT:
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| 290 | ['']
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| 291 | ## END
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| 292 |
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| 293 | #### regex with ?
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| 294 | [[ 'c' =~ c? ]] && echo true
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| 295 | [[ '' =~ c? ]] && echo true
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| 296 | ## STDOUT:
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| 297 | true
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| 298 | true
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| 299 | ## END
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| 300 |
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| 301 | #### regex with unprintable characters
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| 302 | # can't have nul byte
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| 303 |
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| 304 | # This pattern has literal characters
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| 305 | pat=$'^[\x01\x02]+$'
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| 306 |
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| 307 | [[ $'\x01\x02\x01' =~ $pat ]]; echo status=$?
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| 308 | [[ $'a\x01' =~ $pat ]]; echo status=$?
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| 309 |
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| 310 | # NOTE: There doesn't appear to be any way to escape these!
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| 311 | pat2='^[\x01\x02]+$'
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| 312 |
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| 313 | ## STDOUT:
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| 314 | status=0
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| 315 | status=1
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| 316 | ## END
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| 317 |
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| 318 | #### pattern $f(x) -- regression
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| 319 | f=fff
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| 320 | [[ fffx =~ $f(x) ]]
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| 321 | echo status=$?
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| 322 | [[ ffx =~ $f(x) ]]
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| 323 | echo status=$?
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| 324 | ## STDOUT:
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| 325 | status=0
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| 326 | status=1
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| 327 | ## END
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| 328 |
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| 329 | #### pattern a=(1)
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| 330 | [[ a=x =~ a=(x) ]]
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| 331 | echo status=$?
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| 332 | [[ =x =~ a=(x) ]]
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| 333 | echo status=$?
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| 334 | ## STDOUT:
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| 335 | status=0
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| 336 | status=1
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| 337 | ## END
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| 338 | ## BUG zsh status: 1
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| 339 | ## BUG zsh STDOUT:
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| 340 | status=0
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| 341 | ## END
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| 342 |
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| 343 | #### pattern @f(x)
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| 344 | shopt -s parse_at
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| 345 | [[ @fx =~ @f(x) ]]
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| 346 | echo status=$?
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| 347 | [[ fx =~ @f(x) ]]
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| 348 | echo status=$?
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| 349 | ## STDOUT:
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| 350 | status=0
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| 351 | status=1
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| 352 | ## END
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| 353 |
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| 354 |
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| 355 | #### Bug: Nix idiom with closing ) next to pattern
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| 356 |
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| 357 | if [[ ! (" ${params[*]} " =~ " -shared " || " ${params[*]} " =~ " -static ") ]]; then
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| 358 | echo one
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| 359 | fi
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| 360 |
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| 361 | # Reduced idiom
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| 362 | if [[ (foo =~ foo) ]]; then
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| 363 | echo two
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| 364 | fi
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| 365 |
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| 366 | ## STDOUT:
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| 367 | one
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| 368 | two
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| 369 | ## END
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| 370 |
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| 371 | #### unquoted (a b) as pattern, (a b|c)
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| 372 |
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| 373 | if [[ 'a b' =~ (a b) ]]; then
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| 374 | echo one
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| 375 | fi
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| 376 |
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| 377 | if [[ 'a b' =~ (a b) ]]; then
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| 378 | echo BAD
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| 379 | fi
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| 380 |
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| 381 | if [[ 'a b' =~ (a b|c) ]]; then
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| 382 | echo two
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| 383 | fi
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| 384 |
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| 385 | # I think spaces are only allowed within ()
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| 386 |
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| 387 | if [[ ' c' =~ (a| c) ]]; then
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| 388 | echo three
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| 389 | fi
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| 390 |
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| 391 | ## STDOUT:
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| 392 | one
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| 393 | two
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| 394 | three
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| 395 | ## END
|
| 396 |
|
| 397 | #### Multiple adjacent () groups
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| 398 |
|
| 399 | if [[ 'a-b-c-d' =~ a-(b| >>)-c-( ;|[de])|ff|gg ]]; then
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| 400 | argv.py "${BASH_REMATCH[@]}"
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| 401 | fi
|
| 402 |
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| 403 | if [[ ff =~ a-(b| >>)-c-( ;|[de])|ff|gg ]]; then
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| 404 | argv.py "${BASH_REMATCH[@]}"
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| 405 | fi
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| 406 |
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| 407 | # empty group ()
|
| 408 |
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| 409 | if [[ zz =~ ([a-z]+)() ]]; then
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| 410 | argv.py "${BASH_REMATCH[@]}"
|
| 411 | fi
|
| 412 |
|
| 413 | # nested empty group
|
| 414 | if [[ zz =~ ([a-z]+)(()z) ]]; then
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| 415 | argv.py "${BASH_REMATCH[@]}"
|
| 416 | fi
|
| 417 |
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| 418 | ## STDOUT:
|
| 419 | ['a-b-c-d', 'b', 'd']
|
| 420 | ['ff', '', '']
|
| 421 | ['zz', 'zz', '']
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| 422 | ['zz', 'z', 'z', '']
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| 423 | ## END
|
| 424 |
|
| 425 | ## BUG zsh status: 1
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| 426 | ## BUG zsh STDOUT:
|
| 427 | ['']
|
| 428 | ['']
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| 429 | ['']
|
| 430 | ['']
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| 431 | ## END
|
| 432 |
|
| 433 | #### unquoted [a b] as pattern, [a b|c]
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| 434 |
|
| 435 | $SH <<'EOF'
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| 436 | [[ a =~ [ab] ]] && echo yes
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| 437 | EOF
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| 438 | echo "[ab]=$?"
|
| 439 |
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| 440 | $SH <<'EOF'
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| 441 | [[ a =~ [a b] ]] && echo yes
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| 442 | EOF
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| 443 | echo "[a b]=$?"
|
| 444 |
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| 445 | $SH <<'EOF'
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| 446 | [[ a =~ ([a b]) ]] && echo yes
|
| 447 | EOF
|
| 448 | echo "[a b]=$?"
|
| 449 |
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| 450 | ## STDOUT:
|
| 451 | yes
|
| 452 | [ab]=0
|
| 453 | [a b]=2
|
| 454 | yes
|
| 455 | [a b]=0
|
| 456 | ## END
|
| 457 |
|
| 458 | ## OK zsh STDOUT:
|
| 459 | yes
|
| 460 | [ab]=0
|
| 461 | [a b]=1
|
| 462 | yes
|
| 463 | [a b]=0
|
| 464 | ## END
|
| 465 |
|
| 466 | #### c|a unquoted
|
| 467 |
|
| 468 | if [[ a =~ c|a ]]; then
|
| 469 | echo one
|
| 470 | fi
|
| 471 |
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| 472 | ## STDOUT:
|
| 473 | one
|
| 474 | ## END
|
| 475 | ## N-I zsh status: 1
|
| 476 |
|
| 477 | #### Operator chars ; & but not |
|
| 478 |
|
| 479 | # Hm semicolon is still an operator in bash
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| 480 | $SH <<'EOF'
|
| 481 | [[ ';' =~ ; ]] && echo semi
|
| 482 | EOF
|
| 483 | echo semi=$?
|
| 484 |
|
| 485 | $SH <<'EOF'
|
| 486 | [[ ';' =~ (;) ]] && echo semi paren
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| 487 | EOF
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| 488 | echo semi paren=$?
|
| 489 |
|
| 490 | echo
|
| 491 |
|
| 492 | $SH <<'EOF'
|
| 493 | [[ '&' =~ & ]] && echo amp
|
| 494 | EOF
|
| 495 | echo amp=$?
|
| 496 |
|
| 497 | # Oh I guess this is not a bug? regcomp doesn't reject this trivial regex?
|
| 498 | $SH <<'EOF'
|
| 499 | [[ '|' =~ | ]] && echo pipe1
|
| 500 | [[ 'a' =~ | ]] && echo pipe2
|
| 501 | EOF
|
| 502 | echo pipe=$?
|
| 503 |
|
| 504 | $SH <<'EOF'
|
| 505 | [[ '|' =~ a| ]] && echo four
|
| 506 | EOF
|
| 507 | echo pipe=$?
|
| 508 |
|
| 509 | # This is probably special because > operator is inside foo [[ a > b ]]
|
| 510 | $SH <<'EOF'
|
| 511 | [[ '<>' =~ <> ]] && echo angle
|
| 512 | EOF
|
| 513 | echo angle=$?
|
| 514 |
|
| 515 | # Bug: OSH allowed this!
|
| 516 | $SH <<'EOF'
|
| 517 | [[ $'a\nb' =~ a
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| 518 | b ]] && echo newline
|
| 519 | EOF
|
| 520 | echo newline=$?
|
| 521 |
|
| 522 | ## STDOUT:
|
| 523 | semi=2
|
| 524 | semi paren
|
| 525 | semi paren=0
|
| 526 |
|
| 527 | amp=2
|
| 528 | pipe1
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| 529 | pipe2
|
| 530 | pipe=0
|
| 531 | four
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| 532 | pipe=0
|
| 533 | angle=2
|
| 534 | newline=2
|
| 535 | ## END
|
| 536 |
|
| 537 | ## BUG zsh STDOUT:
|
| 538 | semi=1
|
| 539 | semi paren=1
|
| 540 |
|
| 541 | amp=1
|
| 542 | pipe=1
|
| 543 | pipe=1
|
| 544 | angle=1
|
| 545 | newline=1
|
| 546 | ## END
|
| 547 |
|
| 548 |
|
| 549 |
|
| 550 | #### Quotes '' "" $'' $"" in pattern
|
| 551 |
|
| 552 | $SH <<'EOF'
|
| 553 | [[ '|' =~ '|' ]] && echo sq
|
| 554 | EOF
|
| 555 | echo sq=$?
|
| 556 |
|
| 557 | $SH <<'EOF'
|
| 558 | [[ '|' =~ "|" ]] && echo dq
|
| 559 | EOF
|
| 560 | echo dq=$?
|
| 561 |
|
| 562 | $SH <<'EOF'
|
| 563 | [[ '|' =~ $'|' ]] && echo dollar-sq
|
| 564 | EOF
|
| 565 | echo dollar-sq=$?
|
| 566 |
|
| 567 | $SH <<'EOF'
|
| 568 | [[ '|' =~ $"|" ]] && echo dollar-dq
|
| 569 | EOF
|
| 570 | echo dollar-dq=$?
|
| 571 |
|
| 572 | ## STDOUT:
|
| 573 | sq
|
| 574 | sq=0
|
| 575 | dq
|
| 576 | dq=0
|
| 577 | dollar-sq
|
| 578 | dollar-sq=0
|
| 579 | dollar-dq
|
| 580 | dollar-dq=0
|
| 581 | ## END
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| 582 |
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| 583 |
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| 584 | #### Unicode in pattern
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| 585 |
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| 586 | $SH <<'EOF'
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| 587 | [[ μ =~ μ ]] && echo mu
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| 588 | EOF
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| 589 | echo mu=$?
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| 590 |
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| 591 | ## STDOUT:
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| 592 | mu
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| 593 | mu=0
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| 594 | ## END
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| 595 |
|
| 596 | #### Parse error with 2 words
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| 597 |
|
| 598 | if [[ a =~ c a ]]; then
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| 599 | echo one
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| 600 | fi
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| 601 |
|
| 602 | ## status: 2
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| 603 | ## STDOUT:
|
| 604 | ## END
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| 605 |
|
| 606 | ## BUG zsh status: 1
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| 607 | ## BUG zsh STDOUT:
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| 608 | one
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| 609 | ## END
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| 610 |
|
| 611 | #### make a lisp example
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| 612 |
|
| 613 | str='(hi)'
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| 614 | [[ "${str}" =~ ^^([][{}\(\)^@])|^(~@)|(\"(\\.|[^\\\"])*\")|^(;[^$'\n']*)|^([~\'\`])|^([^][ ~\`\'\";{}\(\)^@\,]+)|^[,]|^[[:space:]]+ ]]
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| 615 | echo status=$?
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| 616 |
|
| 617 | m=${BASH_REMATCH[0]}
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| 618 | echo m=$m
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| 619 |
|
| 620 | ## STDOUT:
|
| 621 | status=0
|
| 622 | m=(
|
| 623 | ## END
|
| 624 |
|
| 625 | ## BUG zsh STDOUT:
|
| 626 | status=1
|
| 627 | m=
|
| 628 | ## END
|
| 629 |
|
| 630 | #### Operators and space lose meaning inside ()
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| 631 | [[ '< >' =~ (< >) ]] && echo true
|
| 632 | ## stdout: true
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| 633 | ## N-I zsh stdout-json: ""
|
| 634 | ## N-I zsh status: 1
|
| 635 |
|