$data = 'Sat Jun 4 05:56:00 BST 2005 INFO: PD/ZVKK Load: Starting.';

if ($data =~ /^(.*)?:+\s(.*)?:+\s(.*)$/) {
	# $1 contains the string 'Sat Jun 4 05:56:00 BST 2005 INFO'
	# $2 contains the string 'PD/ZVKK Load'
	# $3 contains the string 'Starting'
}

##</code><code>##

$data = 'Sat Jun 4 05:56:00 BST 2005 INFO: PD/ZVKK Load: Starting.';

@fields = split /:+\s/, $data;

# $fields[0] is 'Sat Jun 4 05:56:00 BST 2005 INFO'
# etc...