Hi,
Try this
Match = "ssrc=("*'|w)*&([a-z]+://|)([^/]++/|)+1.(mid|midi|mp3|wav|wmx|wma)2"
if you change the match like this, it will pick up just the last part after any present / (reasoning if it is not present you already have just the filename)
small explanation for those not seeing it yet
([a-z]+://|) consumes any prsent protocol up to the beginning of the hostname
([^/]++/|)+ hops from slash to slash until any present path level is consumed,
the remainder can then only be the filename...
HTH