use strict;
my $str = '';
my $regex = qr/(?'gPatSyslogPRI'<\d+>)
(?'gPatMesgBody'.*)
(?'gPatMesgBodyMin'.*?)
(?'gPatSyslogNGHeader'\w{3}\s+\d{1,2}\s\d{1,2}:\d{1,2}:\d{1,2}\s\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})
(?'gPatMon'Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec|\d{1,2})
(?'gPatMonNum'\d{1,2})
(?'gPatDay'\d{1,2})
(?'gPatTime'\d{1,2}:\d{1,2}:\d{1,2})
(?'gPatYear'\d{2,4})
(?'gPatMSec'\d{1,3})
(?'gPatTimeMSec'\d{1,2}:\d{1,2}:\d{1,2}\.\d{1,3})
(?'gPatTimeZone'Z|UTC|[+-]\d{1,2}:?\d{2})
(?'gPatWeekday'Mon|Tue|Wed|Thu|Fri|Sat|Sun)
(?'gPatIpV4Dot'\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})
(?'gPatIpAddr'[0-9A-Fa-f]{0,4}(?::[0-9A-Fa-f]{0,4}){1,5}:(?:\d{1,3}(?:\.\d{1,3}){3}|[0-9A-Fa-f]{0,4}(?::[0-9A-Fa-f]{0,4})?)|\d{1,3}(?:\.\d{1,3}){3})
(?'gPatIpPort'\d{1,5})
(?'gPatProto'ftp|icmp|tcp|udp|http|ip|smb|smtp|snmp|others|FTP|ICMP|UDP|TCP|HTTP|IP|SMB|SMTP|SNMP|OTHERS)
(?'gPatFqdn'\w+[.\w+]+)
(?'gPatWord'\w+)
(?'gPatStr'[^\s]*)
(?'gPatHostName'[\w.-]+)
(?'gPatStrComma'[^,]*)
(?'gPatStrLeftParen'[^\(]*)
(?'gPatStrRightSB'[^\]]*)
(?'gPatInt'\d+)
(?'gPatSpace'\s+)
(?'gPatStrEndColon'[^:]*)
(?'gPatStrSQ'[^']*)
(?'gPatStrDQ'[^']*)
(?'gPatSentence'\w[\s+\w]*)/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