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[LUG] Regex

 

Hello.

Does anyone know of a good tutorial for regex?
I know basic syntax, but I never know what to search for when I want 
something more complex.

How can I tell it to keep searching and replacing (even on text it's 
already replaced) until it isn't possible to replace any more?

Also, I can't figure out how to use backreferences.
If I have some string which may or may not have an arbitrary number of 
/'s at the start, how do I get it to print the string without all the 
starting /'s?

This is meant for PHP, but I'm currently trying to test the regex on 
grep/sed.

Thanks.
Simon

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