borked

although, cos I know what you're doing the agent id is a 10 digit string and will only occur once, so to be absolutely sure....

if(preg_match('/agentid\=(\d{10})&listingid/',$str,$matches)){

cos otherwise, the regexp given would pick up also:

$a="...$agentid=1&listingid...etc.";

<- my invoice for this wonderful piece of insight

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(consider figuring out the email as test #1)