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.
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.
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.
RexEgg
Comprehensive resource covering basic to advanced uses of regular expressions. Features regex tutorial, tools, books and tricks.
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