use strict;
my $str = '<input src>
<esi:include src>
<esi:include src/>
<esi:include src />
<esi:include src="http://example.com/1.html" alt="http://bak.example.com/2.html" onerror="continue"/>
<p>
</p>
<esi:in:clude src/>
<esi::include src/>
<esi::::::::::include src>
<:::::::::esi:include src>
';
my $regex = qr%^<\s*(?<Slash>/\s*)?(?<TagName>(?:esi:)?[a-zA-Z0-9-]+)(?<AttrList>[^>]*)>?$%mp;
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