use strict;
my $str = '# This is an H1
content
content
content
## This is an H2 that ends in another H2
matched content 1
matched content 1
matched content 1
## This is an H2 that ends in an H1
matched content 2
matched content 2
matched content 2
# This is an H1, it\'s content doesn\'t belong to any H2
content
content
content
## This is an H2 that goes on until the end of the file
matched content 3
matched content 3
### This H3 belongs to the H2 above
matched content 4
matched content 4';
my $regex = qr/(?:^|\n)##\s[^\n]*\n(.*?)(?=\n##?\s|$)/sp;
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