use strict;
my $str = '1158896,someuser,Inner User,Minor,10.6.130.11,2019-09-29 03:01:15,Security Management,Log in to the server,Network Management,Succeeded,User name: someuser,2019-09-29 03:01:15
1158897,someuser,Inner User,Minor,10.6.130.11,2019-09-29 03:03:16,Security Management,Log out the server,Network Management,Succeeded,"User name: someuserOnline duration: 0 day(s) 0 hour(s) 2 minute(s) 1 second(s)",2019-09-29 03:03:16
';
my $regex = qr/^(\d{7})\,/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