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Regex Tutorial: Lookahead and Lookbehind Zero-Length Assertions
Test for a match, or test for failure, without actually consuming any characters.
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Regex Tutorial: If-Then-Else Conditionals
In Perl’s regex flavor, and compatible flavors, you can use a special construct to create conditional if-then-else regular expressions.
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Regex Tutorial: Possessive Quantifiers
Speed up your regular expressions with possessive quantifiers
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Regular-Expressions.info - Regex Tutorial, Examples and Reference - Regexp Patterns
At Regular-Expressions.info you will find a wide range of in-depth information about a powerful search pattern language called regular expressions.
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