[PHP] preg match

[Chandana Bandara]

This php script perform matching text of some certain URLs. but in this 
preg_match it wont match few patterns <  _ .
with help of this script , can some body help me to match the other all 
patterns .............plz ?



<?php

$user="root";
$pass="****";
$db="aa";
        $dblink = mysql_connect("localhost:3306", "$user", "$pass")or 
die("Could not connect to db");
        mysql_select_db($db) or die ("can't select the db");
        
        $result = mysql_query ("select indexNo,Reply from Acknowledgement order 
by indexNo") or die ("Invalid query");
        while ( $rset= mysql_fetch_array($result)) {
                /* Lets check the reply with the database*/
                $chk_msg= $rset["Reply"];
                //echo "checking $chk_msg in $msg<br>";
                if ( preg_match("/$chk_msg/", "$msg", $match) ) {
                        // match found
                        $SQL="update Status set Status = 'UP' where 
ServiceNo=".$rset["ServiceNo"];
                        mysql_query ("$SQL") or die ("Invalid 2nd query");
                }else{
                        // SERIVCE DOWN
                        // nothing to do here.
                        //echo "No match..<br>";
                }

        }
        mysql_close($dblink);

?>

thanx in advance, 
chandana