#!/usr/bin/perl -w 
use strict;
my $row = "Updated: Mar-11 23:05:50 PST";

if($row =~ /Updated\s*:              #The String "Updated", followed by zero or more spaces, then a colon
           \s*\w+\s*-\s*\d{1,2}\s*   #This matches " Mar-11 "
           \d{1,2}:\d{1,2}:\d{1,2}   #The time
           \s*PST/x) {               #The timezone - do you really need to be this specific?
        print "Match\n";
} else {
        print "No Match\n";
}