use strict;
my $str = 'this is an email: this.is.an-example@example.com
how about a.b.c+194829@example.org?
not totallynotanemail@@exampl.e
';
my $regex = qr/(?(DEFINE)
(?'loc_part' [\w!#$%&'*+\-\/=?^`{|}~]+ )
(?'loc' \g'loc_part' (?: \. \g'loc_part' )* )
(?'subdom' [a-z] (?: [a-z\d-]* [a-z\d] )? )
(?'tld' [a-z]{2,6} )
)
(?'local' \g'loc' ) @ (?'domain' (?: \g'subdom' \. )+ \g'tld' )/ixp;
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