use Regexp::Common qw /balanced/; while (<>) { /$RE{balanced}{-parens=>'()'}/ and print q{balanced parentheses\n}; }
Do not use this module directly, but load it via Regexp::Common.
More than one type of parenthesis can be specified:
$RE{balanced}{-parens=>'(){}'}
in which case all specified parenthesis types must be correctly balanced within the string.
Since version 2013030901, $1 will always be set (to the entire matched substring), regardless whether "{-keep}" is used or not.
qr/$RE{balanced}{-begin => "do|if|case"}{-end => "done|fi|esac"}/
will match properly balanced strings that either start with do and end with done, start with if and end with fi, or start with case and end with esac.
If -end contains less cases than -begin, the last case of -end is repeated. If it contains more cases than -begin, the extra cases are ignored. If either of -begin or -end isn't given, or is empty, -begin => '(' and -end => ')' are assumed.
Since version 2013030901, $1 will always be set (to the entire matched substring), regardless whether "{-keep}" is used or not.
For a start, there are many common regexes missing. Send them in to regexp-common@abigail.be.
This module is free software, and maybe used under any of the following licenses:
1) The Perl Artistic License. See the file COPYRIGHT.AL. 2) The Perl Artistic License 2.0. See the file COPYRIGHT.AL2. 3) The BSD License. See the file COPYRIGHT.BSD. 4) The MIT License. See the file COPYRIGHT.MIT.