use strict;
my $str = '<li><a href="http://www.userlink1.com/my/page.html" custattr="value1"><img alt="Userlink" class="common_link_class" height="123" src="pic0.png" width="123" style="width: 123px;"></a></li><li><a href="//www.socnet1.com/username1.css" custattr="value1"><img alt="Socnet1" class="common_link_class" height="123" src="pic1.png" width="123" style="width: 123px;"></a></li><li><a href="//www.socnet2.com/username1.js" custattr="value1"><img alt="Socnet2" class="common_link_class" height="123" src="pic2.png" width="123" style="width: 123px;"></a></li><li><a href="mailto:useralias1@unlikely.zyx321.usermail.net" custattr="value1"><img alt="Usermail" class="common_link_class" height="123" src="pic3.png" width="123" style="width: 123px;"></a></li><li><a href="/www.userlink2.com/my/page.php?id=2&ok=1" custattr="value1"><img alt="Userlink" class="common_link_class" height="123" src="pic4.png" width="123" style="width: 123px;"></a></li>
';
my $regex = qr/href=(["|\']\/?["|\'])/ip;
if ( $str =~ /$regex/ ) {
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