use strict;
my $str = '####################################################################################
# <IP-Address> <ServiceType> <ServiceName> <MaxMemory> <Port>
####################################################################################
#192.168.122.225 database database 1024M
#192.168.122.226 database database 1024M
192.168.122.253 database database 1024M
## MCng BackEnd ServicesG
#192.168.122.125 amqs activemq 1024M
#
# <IP-Address> <ServiceType> <ServiceName> <MaxMemory> <JMXPort> <WebPort> #
#
192.168.122.125 csm csm 2048M 12000
192.168.122.125 clog clog 1024M 12001
192.168.122.146 sec
192.168.122.105 dtu-ds dtu-ds01 4096M 12004 ';
my $regex = qr/(\d+\.\d+\.\d+\.\d+)\s+([\w\-]+)\s+([\w\-]+)\s+(\w+)\s+(\d+)\s+/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