use strict;
my $str = 'alabaster==0.7.9
blow_ster==1.2.3
brewster-ify==2.3.4
filler_==8.2.1
arrow==0.8.0
awesome-slugify==1.6.5
Babel==2.3.4
binaryornot==0.4.0
blessings==1.6';
my $regex = qr/\w+[-_]{0,1}\w+/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