Regex

General

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

• http://en.wikipedia.org/wiki/Perl_Compatible_Regular_Expressions
• http://www.pcre.org/

• http://us2.php.net/manual/en/book.pcre.php

• https://github.com/VerbalExpressions

• https://codegolf.stackexchange.com/questions/17718/meta-regex-golf
• http://nbviewer.ipython.org/url/norvig.com/ipython/xkcd1313.ipynb [1]

Guides

• regex cheatsheet

• http://qntm.org/files/re/re.html [2]
• 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

Web tools

• http://regex101.com/

• http://gskinner.com/RegExr/

• http://buildregex.com/
• http://myregextester.com/
• http://regexpal.com/
• http://regex.inginf.units.it/
• http://www.debuggex.com/
• http://www.regexper.com/ -js
• http://www.spaweditor.com/scripts/regex/ - php
• http://www.regextester.com/index2.html

• http://www.pcreck.com/ - pcre

• http://stevenlevithan.com/regex/colorizer/
• http://www.myezapp.com/apps/dev/regexp/show.ws

• http://txt2re.com/
• http://rubular.com/

• http://regexcrossword.com/
• http://regex.alf.nu/

GUI

• http://regexxer.sourceforge.net/