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I recently studying 'Regular Expressions' and came across 2 forms of it. POSIX-Regex and PCRE (Perl Compatible Regular Expressions)

Many editors support searching via 'Regular Expressions', do they consider both of the above forms? Is it that one if more used than other? Also are there any good guides to learn PCRE Expressions, currently I am reading: http://php.net/manual/en/reference.pcre.pattern.syntax.php

Akash
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    * See also [Open source RegexBuddy alternatives](http://stackoverflow.com/questions/89718/is-there) and [Online regex testing](http://stackoverflow.com/questions/32282/regex-testing) for some helpful tools, or [RegExp.info](http://regular-expressions.info/) for a nicer tutorial. – mario Dec 18 '12 at 02:35

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There are even many more types of regular expressions. You might want to call them dialects.

What type of regex is applied by editors is often not clearly shown. You will have to rely on the documentation or make a few tests yourself to find out. There are tools where you can switch between different types.

As far as I know PCRE are the most commom type supported. Not because they are better, in fact POSIX is more logical, but simply because their processing is more efficient.

arkascha
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