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. The sites in this section provide help, tutorials and collections of frequently asked questions ("FAQs") about various aspects of regular expressions.
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- Seeing With C Technical article about regular expressions. Discusses types of automata, searching, parsing, validating.
- GNU Emacs Documentation for regex in Emacs Lisp. Describes the functions.
- Digital Amit Introduction to regex. Presents syntax and examples.
- GNU Awk User's Guide Regex manual pages for Awk. Discusses syntax, dynamic regexps.
- So What's a Regular Expression Anyway Introduction to regex. Presents syntax, code samples.
- PCRE Wrapper for Delphi 7 Wrapper classes to support PCRE in Delphi. Includes download links.
- Regular Expressions Notes from computer science class about TCL. Presents the Chomsky hierarchy, finite automata and regular expressions.
- Unicode Regular Expressions Unicode Technical Standard document. Describes guidelines for extending regex engines to use Unicode.
- C# Regular Expressions Article by O'Reilly author. Presents classes, engine details and sample expressions.
- Flagrant Badassery Blog of Steven Levithan. Discusses the Regex Cookbook by Levithan and Jan Goyvaerts, regex APIs and regex recipes.
- Regular Expressions Cheat Sheet One-page reference. Presents major points of regex syntax.
- Four Guys from Rolla Articles about regular expressions. Includes articles about parsing, validating and replacing.
- Finite Automata and Regular Expressions Notes from computer science class. Compares regular expressions to finite automata.
- .NET Framework Regular Expressions MSDN documentation. Features detailed examples, list of references.
- The Code Project Collection of articles. Features tools, general techniques and regex implementation in various languages.
- Zvon.org Regex resources. Features tutorial, reference and glossary.
- Advanced Regular Expression Tips and Techniques Blog post. Discusses techniques such as commenting, callbacks, lookarounds, conditionals and named patterns.
- MySQL Regular Expressions Manual page for MySQL regex. Features operators and character classes, includes user comments.
- StackOverflow Tagged Questions FAQ Collection of questions and user-submitted answers. Features ratings for each answer and comment.
- Regular Expressions in Grep Command Series of two articles about regex in the Unix Grep command. Features examples of text searches.
- Regular Expressions in Grep Tutorial on nixCraft blog. Features syntax, tricks, comments.
- PHP Manual Regex section of the PHP manual. Covers PCRE engine, pattern syntax, PHP functions, and includes user comments.
- PHPFreaks Regex board on PHP forum. Features user-contributed questions and answers.
- Regular Expression HowTo Python regex tutorial. Focuses on the re module.
- Haskell Review of regex libraries in the Haskell programming language. Includes feature matrix and benchmark.