Regular expressions are text strings formed in a particular syntax that is used in various tools and programming languages for searching text patterns within text.
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- Mastering Regular Expressions Official page for book by Jeffrey Friedl published by O'Reilly. Includes table of contents, index and code.
- Regular-Expressions.info Comprehensive resource with a focus on the regex features supported by RegexBuddy. Features tutorial, flavor comparison, books, tools written by the author.
- RegExLib Library of user-submitted expressions. Includes tester and resources.
- RegexOne Online regex course. Features more than ten interactive lessons, as well as practical examples.
- RexEgg Comprehensive resource covering basic to advanced uses of regular expressions. Features regex tutorial, tools, books and tricks.