http://web.archive.org/web/*/http://regexps.srparish.net/src/ http://web.archive.org/web/*/http://regexps.srparish.net/src... has a few versions of hackerlab an

http://web.archive.org/web/*/http://regexps.srparish.net/src/ http://web.archive.org/web/*/http://regexps.srparish.net/src... has a few versions of hackerlab and pika. hackerlab is also part of tla distributions (since the latter uses the former extensively) hackerlab contains (some version of) rx.