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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.

Resources in This Category

• .NET Framework Regular Expressions

  http://msdn.microsoft.com/en-us/library/hs600312.aspx
  MSDN documentation. Features detailed examples, list of references.

• Advanced Regular Expression Tips and Techniques

  http://net.tutsplus.com/tutorials/php/advanced-regular-expression-tips-and-techniques/
  Blog post. Discusses techniques such as commenting, callbacks, lookarounds, conditionals and named patterns.

• C# Regular Expressions

  http://oreilly.com/windows/archive/csharp-regular-expressions.html
  Article by O'Reilly author. Presents classes, engine details and sample expressions.

• Digital Amit

  http://www.digitalamit.com/article/regular_expression.phtml
  Introduction to regex. Presents syntax and examples.

• Finite Automata and Regular Expressions

  http://www.cs.rochester.edu/u/nelson/courses/csc_173/fa/
  Notes from computer science class. Compares regular expressions to finite automata.

• Flagrant Badassery

  http://blog.stevenlevithan.com/
  Blog of Steven Levithan. Discusses the Regex Cookbook by Levithan and Jan Goyvaerts, regex APIs and regex recipes.

• Four Guys from Rolla

  http://www.4guysfromrolla.com/webtech/RegularExpressions.shtml
  Articles about regular expressions. Includes articles about parsing, validating and replacing.

• GNU Awk User's Guide

  http://www.gnu.org/software/gawk/manual/html_node/Regexp.html
  Regex manual pages for Awk. Discusses syntax, dynamic regexps.

• GNU Emacs

  http://www.gnu.org/software/emacs/emacs-lisp-intro/html_node/Regexp-Search.html
  Documentation for regex in Emacs Lisp. Describes the functions.

• Haskell

  https://wiki.haskell.org/Regular_expressions
  Review of regex libraries in the Haskell programming language. Includes feature matrix and benchmark.

• MySQL Regular Expressions

  http://dev.mysql.com/doc/refman/5.1/en/regexp.html
  Manual page for MySQL regex. Features operators and character classes, includes user comments.

• PCRE Wrapper for Delphi 7

  http://www.renatomancuso.com/software/dpcre/dpcre.htm
  Wrapper classes to support PCRE in Delphi. Includes download links.

• PHP Manual

  http://www.php.net/manual/en/book.pcre.php
  Regex section of the PHP manual. Covers PCRE engine, pattern syntax, PHP functions, and includes user comments.

• PHPFreaks

  http://forums.phpfreaks.com/forum/34-php-regex/
  Regex board on PHP forum. Features user-contributed questions and answers.

• Regular Expression HowTo

  https://docs.python.org/2/howto/regex.html
  Python regex tutorial. Focuses on the re module.

• Regular Expressions

  http://www2.lib.uchicago.edu/~keith/tcl-course/topics/regexp.html
  Notes from computer science class about TCL. Presents the Chomsky hierarchy, finite automata and regular expressions.

• Regular Expressions Cheat Sheet

  http://www.addedbytes.com/cheat-sheets/download/regular-expressions-cheat-sheet-v2.pdf
  One-page reference. Presents major points of regex syntax.

• Regular Expressions in Grep

  http://www.cyberciti.biz/faq/grep-regular-expressions/
  Tutorial on nixCraft blog. Features syntax, tricks, comments.

• Regular Expressions in Grep Command

  http://www.thegeekstuff.com/2011/01/regular-expressions-in-grep-command/
  Series of two articles about regex in the Unix Grep command. Features examples of text searches.

• Seeing With C

  http://www.seeingwithc.org/topic7html.html
  Technical article about regular expressions. Discusses types of automata, searching, parsing, validating.

• So What's a Regular Expression Anyway

  http://www.melonfire.com/community/columns/trog/article.php?id=2
  Introduction to regex. Presents syntax, code samples.

• StackOverflow Tagged Questions FAQ

  http://stackoverflow.com/questions/tagged/regex?sort=faq
  Collection of questions and user-submitted answers. Features ratings for each answer and comment.

• The Code Project

  http://www.codeproject.com/search.aspx?q=regular+expression
  Collection of articles. Features tools, general techniques and regex implementation in various languages.

• Unicode Regular Expressions

  http://www.unicode.org/reports/tr18/
  Unicode Technical Standard document. Describes guidelines for extending regex engines to use Unicode.

• Zvon.org

  http://www.zvon.org/comp/m/regexp.html
  Regex resources. Features tutorial, reference and glossary.

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