use strict;
my $str = 'Find arguments inside balanced parenthesis.
Regex idea from Marco https://stackoverflow.com/a/10596403/1898524
( arg1, arg2, arg3, (arg4), \'(pip\' )
trim(( arg1, arg2, arg2a, arg3, (arg4), \'(pip\' ))
SELECT ISNULL(string, left(1,13) )
SELECT ISNULL(string,\'x\' )
SELECT ISNULL(string, char(13) )
SELECT ISNULL(string, char(13) ), ISNULL(string, \'x\' )
ISNULL( x )
ISNULL( char(13))
SELECT MID(LTRIM(RTRIM(ISNULL(string, char(13)))),4,8) <-- Does not work on a heavily nested function.
';
my $regex = qr/\((?<arguments>(([^\(\)']*)|(\([^\(\)']*\))|'(.*?)')*)\)/p;
if ( $str =~ /$regex/g ) {
print "Whole match is ${^MATCH} and its start/end positions can be obtained via \$-[0] and \$+[0]\n";
# print "Capture Group 1 is $1 and its start/end positions can be obtained via \$-[1] and \$+[1]\n";
# print "Capture Group 2 is $2 ... and so on\n";
}
# ${^POSTMATCH} and ${^PREMATCH} are also available with the use of '/p'
# Named capture groups can be called via $+{name}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Perl, please visit: http://perldoc.perl.org/perlre.html