There is a Regular Expressions tutorial from
NASA but a litle outdated(last update was on September 1992)
A other nice tutorial with some easy to understand examples you can found at
here.
Also a good tutorial can be found at
perlarchive. But for some reson "unable to resolve (tlc.perlarchive.com)".. MAybe later it will work(i visit that page some day's ago, nop i don't remember the ip :P)..
