note 51808 deleted from function.preg-replace by didou

Note Submitter: greenthumb at 4point-webdesign dot com ---- I use the following function to eliminate parameters from a given querystring that i don't want in the qry by telling which ones are allowed: <?php function cleanqry($allow,$qry) { $allow=str_replace(',','|',$allow); $qry=preg_replace( '#([^\=&\?]+)(?<!'.$allow.')\=([^\=&]+)(&)?#', '', $qry); return $qry; } echo cleanqry('g1|g2|g3', 'g1=good&g4=bad&g2=good&g3=good&g5=bad'); /* output: g1=good&g2=good&g3=good& */ ?> maybe you have to check for lost "?" or "&", i left this out because i only want a function for the "core-problem" :)