Unless you use something somewhat exotic, your problem won't be about performance about an interpreted language A and compile language B.
Because if you/your team know A and not B and so write way better code in A than B you can end up having much better performance in A than B. If you have people experimented in one language and the language/libraries can does the job you need, stick to it.
Edit from igouy : here's a link about regex ni various language, you'll see that regex are implemented better in some language even if compiled or not : http://benchmarksgame.alioth.debian.org/u64q/performance.php?test=regexdna