Regex

General

• https://en.wikipedia.org/wiki/Regular_expression

• Regular-Expressions.info

Types

POSIX

• POSIX Basic and Extended Regular Expressions
• MySQL - Regular Expressions - ERE

PCRE

• PCRE - Perl Compatible Regular Expressions - The PCRE library is a set of functions that implement regular expression pattern matching using the same syntax and semantics as Perl 5. PCRE has its own native API, as well as a set of wrapper functions that correspond to the POSIX regular expression API. The PCRE library is free, even for building proprietary software.
• https://en.wikipedia.org/wiki/Perl_Compatible_Regular_Expressions

• http://perldoc.perl.org/perlre.html

• http://affy.blogspot.co.uk/p5be/ch10.htm

• http://www.regular-expressions.info/pcre.html
• http://us2.php.net/manual/en/book.pcre.php

Guides

• regex cheatsheet

• http://qntm.org/files/re/re.html [1]
• http://regex.learncodethehardway.org/book/
• http://net.tutsplus.com/tutorials/javascript-ajax/you-dont-know-anything-about-regular-expressions/

• http://swtch.com/~rsc/regexp/regexp1.html
• http://stackoverflow.com/questions/16621738/d-less-efficient-than-0-9
• http://stackoverflow.com/questions/1732348/regex-match-open-tags-except-xhtml-self-contained-tags

• https://news.ycombinator.com/item?id=6812953

• http://blog.mariusschulz.com/2014/06/03/why-using-in-regular-expressions-is-almost-never-what-you-actually-want [2]

Web tools

Search

• RegExr is an online tool to learn, build, & test Regular Expressions (RegEx / RegExp). Results update in real-time as you type. Roll over a match or expression for details. Save & share expressions with others. Explore the Library for help & examples. Undo & Redo with Ctrl-Z / Y. Search for & rate Community patterns.

• Debuggex - Online visual regex tester. JavaScript, Python, and PCRE.

• Build RegEx - A Regular Expression GUI.

• RegexPalregexpal — a JavaScript regular expression tester

• Automatic Generation of Regular Expressions from Examples - with examples and generation from csv

• Rubular - a Ruby regular expression editor

• Regexper - JS

• PCREck - a multi-dialect regular expression editor

• Regular Expression Analyzer - An online regular expression tool that helps analyzing regular expression structure.

• txt2re - regular expression generator (perl php python java javascript coldfusion c c++ ruby vb vbscript j# c# c++.net vb.net)

Search and replace

• regular expressions 101 — an online regex tester for javascript, php, pcre and python.
  • http://regex101.com/?tour

• My Regex Tester - PHP PCRE with search and replace

• REGex TESTER - ver. 1.5.3
• Regex Tester 2.0 alpha

Software

• regexxer is a nifty GUI search/replace tool featuring Perl-style regular expressions

Library

• Regex Colorizer - JS library

Other

• Regex Crossword is a crossword puzzle game, where the crossword clues are defined using regular expressions.

• https://codegolf.stackexchange.com/questions/17718/meta-regex-golf
• http://nbviewer.ipython.org/url/norvig.com/ipython/xkcd1313.ipynb [3]
• http://regex.alf.nu/

• https://github.com/VerbalExpressions