Regular Expression Patterns

From various sources I have collected the following regular expression patterns. They helped me a lot in front-end and back-end validation.

Alpha:

Pattern: ^[a-zA-Z_ ]+$
Description: Allows only ‘A-Z’, ‘a-z’, space ( ‘ ‘ ) and underscore ( ‘_’).

Alphanumeric:

Pattern: ^[a-zA-Z0-9_ ]+$
Description: Allows only ‘A-Z’, ‘a-z’, ‘0-9’, space ( ‘ ‘ ) and underscore ( ‘_’).

Email:

Pattern: /^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i

Numeric:

Pattern: ^\d+$

Decimal:

Pattern: ^\d+(?:\.\d{0,2})?$

Date – 1:

Pattern: ^(0[1-9]|[1,2][0-9]|3[0-1])-(0[1-9]|1[0,1,2])-\d{4}$
Description: Date format DD-MM-YYYY

Date – 2:

Pattern: ^(0[1-9]|1[0,1,2])-(0[1-9]|[1,2][0-9]|3[0-1])-\d{4}$
Description: Date format MM-DD-YYYY

US Zip Code:

Pattern: ^\d{5}$

US Telephone Number:

Pattern: ^1?[\-]?\(?\d{3}\)?[\-]?\d{3}[\-]?\d{4}$

Color Code:

Pattern: ^#{1}?([a-f]|[A-F]|[0-9]){3}(([a-f]|[A-F]|[0-9]){3})?$

Any HTML Tag:

Pattern: <([^">]+(?:”[^”]+”)*[^>]+)>

5 Comments

• 

  By Arafat Rahman, June 29, 2008 @ 2:29 pm

  Thanks for the post. It covers common regular expression patterns.
  Here you can find more details about regular expression
  http://www.ilovejackdaniels.com/cheat-sheets/regular-expressions-cheat-sheet/
• 

  By Mohammad Sajjad Hossain, July 2, 2008 @ 11:25 pm

  Thank you Arafat for providing the link. It is really helpful.
• 

  By Naseer Ahmad Mughal, September 15, 2008 @ 2:37 pm

  Thanks both of you for such a nice information to share.
• 

  By Raihan, November 26, 2008 @ 11:04 am

  Here you can find millions – http://www.regexlib.com
• 

  By Mohammad Sajjad Hossain, November 26, 2008 @ 11:23 am

  @Thank you Naseer.

  @Raihan Bhai, thanks for the link. My intension was to provide some expressions which we need time to time.

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