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From: Sebastian Gniazdowski <sgniazdowski@gmail.com>
Date: Sun, 16 Oct 2016 11:15:08 +0200
Message-ID: <CAKc7PVCt1BOU1_M_3AaRgnVDihKemJE0OQMmqY33BZXOhq0xEQ@mail.gmail.com>
Subject: $match size limit, suspicious (#B) behavior
To: Zsh hackers list <zsh-workers@zsh.org>
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Hello,
turns out $match has a size limit of 9:

% a=3D'abcdefghijk'; [[ "$a" =3D (#b)(a)(b)(c)(d)(e)(f)(g)(h)(i)(j)(k) ]]
&& echo "match[9]: $match[9], match[10]: $match[10]"
match[9]: i, match[10]:

Which can be to some extent worked around with (#B):

% a=3D'abcdefghijk'; [[ "$a" =3D
(#b)(a)(b)(c)(d)(#B)(e)(#b)(f)(g)(h)(i)(j)(k) ]] && echo "match[9]:
$match[9], match[10]: $match[10]"
match[9]: j, match[10]:

Now the difficult part =E2=80=93 but just count the parentheses before and
after (#B) =E2=80=93 my input is:

mybuf=3D'if [[ "$mybuf" =3D
(#b)(\$([[:alpha:]_][[:alnum:]_]#|[[:digit:]]##)(\[[^[:space:]]#\])(#c0,1))=
(*)
]]; then : fi'

Now code that matches either $var, ${var}, \$:

while [[ "$mybuf" =3D
(#b)([^\$\\]#)((#B)(\$([[:alpha:]_][[:alnum:]_]#|[[:digit:]]##)(\[[^[:space=
:]]#\])(#c0,1))|(\$[{](\([a-zA-Z0@%#]##\))(#c0,1)([[:alpha:]_][[:alnum:]_]#=
|[[:digit:]]##)(\[[^[:space:]]#\])(#c0,1)[}])|([\\][\'\"\$]))(#b)(*)
]]; do
    echo "Got: ${match[2]}"
    echo "Match 1: ${match[1]}"
    echo "Match 2: ${match[2]}"
    echo "Match 3: ${match[3]}"
    echo "Match 4: ${match[4]}"
    echo "Match 5: ${match[5]}"
    echo "Match 6: ${match[6]}"
    echo "Match 7: ${match[7]}"
    echo "Match 8: ${match[8]}"
    echo "Match 9: ${match[9]}"
    mybuf=3D"${match[8]}"
  done

Output is:

Got: $mybuf
Match 1: if [[ "
Match 2: $mybuf
Match 3:
Match 4:
Match 5:
Match 6:
Match 7:
Match 8: " =3D (#b)(\$([[:alpha:]_][[:alnum:]_]#|[[:digit:]]##)(\[[^[:space=
:]]#\])(#c0,1))(*)
]]; then : fi
Match 9:

Got: \$
Match 1: " =3D (#b)(
Match 2: \$
Match 3:
Match 4:
Match 5:
Match 6:
Match 7: \$
Match 8: ([[:alpha:]_][[:alnum:]_]#|[[:digit:]]##)(\[[^[:space:]]#\])(#c0,1=
))(*)
]]; then : fi
Match 9:

"Match 8: .." is: "the rest", i.e. (*). "Match 1: .." is: "before".
"Match 2: .." is the $var, ${var} or \$.

The problem: (#B) should have disabled all parentheses from where it
is placed, and "Match 8: ..." should be at "Match 3: ..". Also, "Match
7: .." has the same value as "Match 2: ..", which seems to be a
problem.

Best regards,
Sebastian Gniazdowski