use strict;
my $str = 'use strict;
use warnings;
my $text = << "END";
int max(int x, int y)
{
if (x > y)
{
return x;
}
else
{
return y;
}
}
// something here
';
my $regex = qr/(?(DEFINE)
(?<block>
\{ # Match opening brace
(?: # Start non-capturing group
[^{}]++ # Match non-brace characters without backtracking
| # or
(?&block) # Recursively match the last captured group
)* # Match 0 or more times
\} # Match closing brace
)
)(.+?)(?&block)(.+)/xsp;
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