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preg_match() [function.preg-match]: Unknown modifier 'd'

Last Modified: 2013-12-12
Hello has anybody ever received this warning?? everything seems to be ok, and is working fine but I still receive this warning. The hilarious thing is, the warning appears even when 'd' isn't a character in the data being passed. I have tried to google it but, not a lotof help.
foreach($brk as $key=>$value)
$pattern1 = "/^option/";	
$pattern2 = "/^".$brk['rowId']."selectoption_/";
							if(preg_match($pattern1,$key) || preg_match($pattern2,$key))

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