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1. Useful regular expressions

   Regular Expression regex saved by 12 people
   posted on March 31, 2010 by vagrantradio

2. Apache redirect from domain.com to www.domain.com

   Regular Expression apache configuration saved by 11 people
   posted on October 8, 2007 by therobot

3. Convert whitespace to underscores

   Regular Expression regex whitespace RegularExpression saved by 8 people
   posted on December 12, 2007 by lagrangeapex

4. The Best Email RegEx (yet)

   Regular Expression regex email saved by 7 people
   posted on June 13, 2010 by nkm

5. Find CSS Style Definitions

   Regular Expression regex css regular expressions styles saved by 7 people
   posted on August 4, 2009 by mocha0range

6. Validate US ZIP Code

   Regular Expression saved by 7 people
   posted on August 9, 2008 by Scooter

7. Validate e-mail address

   Regular Expression saved by 7 people
   posted on August 2, 2008 by Scooter

8. JS Email Validation

   Regular Expression regex saved by 7 people
   posted on March 10, 2008 by beforebeta

9. USA Social Security Number

   Regular Expression saved by 7 people
   posted on October 19, 2007 by edwinjanmoss

10. IP Address

    Regular Expression saved by 7 people
    posted on October 19, 2007 by edwinjanmoss

11. Time

    Regular Expression saved by 7 people
    posted on October 19, 2007 by edwinjanmoss

12. Regular Expression to Grab the Content of an XML Element

    Regular Expression xml RegularExpression saved by 7 people
    posted on May 16, 2007 by rengber

13. Regular Expressions For URI Validation/Parsing

    Regular Expression regex email url javascript parse validation uri mailto address saved by 6 people
    posted on June 24, 2008 by wizard04

14. Grab an html tag and leave just the content

    Regular Expression html find-and-replace saved by 6 people
    posted on July 20, 2007 by rhlowe

15. Find CSS Style Names

    Regular Expression regex css regular expressions styles saved by 5 people
    posted on August 4, 2009 by mocha0range

16. IBAN regex (all IBANs)

    Regular Expression regex iban saved by 5 people
    posted on May 26, 2009 by resurge

17. Validate UK PostCode

    Regular Expression saved by 5 people
    posted on August 23, 2008 by Scooter

18. IP address

    Regular Expression saved by 5 people
    posted on January 21, 2008 by alti

19. remove all non-number characters

    Regular Expression saved by 5 people
    posted on January 21, 2008 by alti

20. Date

    Regular Expression saved by 5 people
    posted on October 19, 2007 by edwinjanmoss

21. RFC 2822 Email Validation

    Regular Expression regex email validation rfc 2822 saved by 4 people
    posted on October 11, 2009 by pacey

22. Validate a URL

    Regular Expression regex url validation saved by 4 people
    posted on September 10, 2009 by meggesje

23. Find CSS Attributes

    Regular Expression regex css regular expressions styles saved by 4 people
    posted on August 4, 2009 by mocha0range

24. Regular expression: catch img src attribute in html

    Regular Expression html regexep saved by 4 people
    posted on February 11, 2009 by albertomori

25. SSN Social Security Numbers

    Regular Expression regex ssn saved by 4 people
    posted on November 11, 2008 by binarynomad

26. IPv4 Address

    Regular Expression regex ip saved by 4 people
    posted on November 11, 2008 by binarynomad

27. Validate Canadian Postal Code

    Regular Expression saved by 4 people
    posted on August 16, 2008 by Scooter

28. US Phone Number with extension, flexible

    Regular Expression regex phone us extension saved by 4 people
    posted on March 13, 2008 by martinkas

29. Canadian Social Insurance Number

    Regular Expression saved by 4 people
    posted on October 19, 2007 by edwinjanmoss

30. US zip code

    Regular Expression saved by 4 people
    posted on October 19, 2007 by edwinjanmoss

31. Hexadecimal Value

    Regular Expression regexp hexadecimal saved by 4 people
    posted on November 20, 2006 by Corhol

32. RegEx to find replace in TextMate

    Regular Expression regex php textmate search replace saved by 3 people
    posted on May 27, 2010 by rwczippy

33. REGEXP - Test of password is strong

    Regular Expression saved by 3 people
    posted on March 31, 2010 by level09

34. REGEXP - Validate a URL

    Regular Expression saved by 3 people
    posted on March 31, 2010 by level09

35. Email validation Regex

    Regular Expression saved by 3 people
    posted on March 27, 2009 by Providence

36. US Phone Numbers

    Regular Expression regex phone-us saved by 3 people
    posted on November 11, 2008 by binarynomad

37. MAC Addresses

    Regular Expression regex mac saved by 3 people
    posted on November 11, 2008 by binarynomad

38. regex to trim data from beginning of a line

    Regular Expression regex am pm bb saved by 3 people
    posted on September 23, 2008 by jhenry

39. Regular Expressions for U.S. Phone Numbers

    Regular Expression regex javascript phone saved by 3 people
    posted on July 31, 2008 by wizard04

40. Validate IP Address

    Regular Expression saved by 3 people
    posted on July 26, 2008 by Scooter