regex for xsl

It's is common practice to break up the relative path to extract the DCR category type etc from a expression like this

$DCRDir !~ m#.+\/WORKAREA\/([^\/]+)\/templatedata\/[^\/]+\/[^\/]+\/data\/([^\/]+)\/?.*$#

if we print S1, S2 we get our values. Can anyone give me a good link as how to do this inside an xsl?

Thank You