use strict;
my $str = 'Jan 17 08:49:00 thesquareplanet.com sshd[2744]: Disconnected from invalid user wp-user 89.134.42.194 port 38866 [preauth]
Jan 17 03:13:00 thesquareplanet.com sshd[2631]: Disconnected from invalid user Disconnected from 46.97.239.16 port 55920 [preauth]
Jan 17 10:00:29 thesquareplanet.com sshd[2775]: Disconnected from user jon 18.26.4.53 port 39872';
my $regex = qr/.*Disconnected from (invalid |authenticating )?user .* [^ ]+ port [0-9]+( \[preauth\])?$/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