Regular expression

Tools

• http://rubular.com
• http://regexpal.com/ - A Javascript regex tester.
• http://www.regexper.com - visualize regular expression
• https://www.debuggex.com/
• http://regex.inginf.units.it/: automatic regex generator using Machine learning

Tuturials

• http://regexcrossword.com

Examples

• regex for testing Prime number: http://www.noulakaz.net/weblog/2007/03/18/a-regular-expression-to-check-for-prime-numbers/
• Writing a regex for email addresses is hard
  • http://stackoverflow.com/questions/201323/using-a-regular-expression-to-validate-an-email-address/201378#201378
  • http://ex-parrot.com/~pdw/Mail-RFC822-Address.html

Articles

• http://xkcd.com/208/
• http://www.pythonforbeginners.com/systems-programming/regular-expressions-in-python/
• stack overflow: RegEx match open tags except XHTML self-contained tags - about parsing HTML with regex. Use Web mining tools instead!