use strict;
my $str = 'May 9 14:30:00 10.25.8.3 %ASA-6-302013: Built outbound TCP connection 1032748840 for MGM-CML-NON-LB-SRV-Log:10.25.3.21/9997 (10.25.3.21/9997) to MIT-IBMgmt-NW:10.70.21.165/4379 (10.70.21.165/4379)';
my $regex = qr/(?<src_ip>\d{0,2}\.\d{0,2}\.\d{0,2}\.\d{0,2})\s(?<signture>%(?<product>ASA))-(?<version>(?<release>\d+)-(?<build>\d+)):/p;
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