I'm looking at the expected answers and I'm not sure that your regular expression is correct. By looking for /ad/i, you are looking for a and d right next to each other. If the parameter you are sending is "a,d", then you will not get a match. If they are only coming in that order, then you could change your regular expression to /a,d/. If not then 
if(param('s1') =~ /a/ && param('s1') =~ /d/)
should work.

In reply to Re: Match function not providing results by Steve_p
in thread Match function not providing results by chriso

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