RegExLib.com - The first Regular Expression Library on the Web!

Title	Test Details Pattern Title
Expression	(\w+)\s+\1
Description	This expression uses a BackReference to find occurrences of the same word twice in a row (separated by a space). Matches things like 'mandate dated', which may not be desirable. See Sean Carley's update for a better expression for true repeated word matching.
Matches	hubba hubba | mandate dated | an annual
Non-Matches	may day | gogo | 1212
Author	Rating: Steven Smith

Title	Test Details Pattern Title
Expression	\(([0-9]{2}|0{1}((x|[0-9]){2}[0-9]{2}))\)\s*[0-9]{3,4}[- ]*[0-9]{4}
Description	Match diferent styles for brazilian Phone number code. Only DDD (12), complete DDD (012), complete DDD + Telephony Company (0xx12) plus 3 or 4 digits (city code) plus 4 digits (phone number).
Matches	(12) 123 1234 | (01512) 123 1234 | (0xx12) 1234 1234
Non-Matches	12 123 1234 | (012) 123/1234 | (012) 123 12345
Author	Rating: Samuel Mota

Title	Test Details Pattern Title
Expression	^\w+[\w-\.]*\@\w+((-\w+)|(\w*))\.[a-z]{2,3}$
Description	Email validation. With this short expression you can validate for proper email format. It's short and accurate.
Matches	[email protected] | [email protected] | [email protected]
Non-Matches	[email protected] | [email protected] | smith@foo_com
Author	Rating: Eric Lebetsamer

Title	Test Details Pattern Title
Expression	^#?([a-f]|[A-F]|[0-9]){3}(([a-f]|[A-F]|[0-9]){3})?$
Description	Tests for valid HTML hexadecimal color codes. The # symbol is optional. And it will except either the 3 digit form for the 216 Web safe colors, or the full 6 digit form. I am use it on my site to allow users to customize the site's colors.
Matches	#00ccff | #039 | ffffcc
Non-Matches	blue | 0x000000 | #ff000
Author	Rating: Chris Craft

Title	Test Details Pattern Title
Expression	^([0-9]( |-)?)?(\(?[0-9]{3}\)?|[0-9]{3})( |-)?([0-9]{3}( |-)?[0-9]{4}|[a-zA-Z0-9]{7})$
Description	Matches US phone number format. 1 in the beginning is optional, area code is required, spaces or dashes can be used as optional divider between number groups. Also alphanumeric format is allowed after area code.
Matches	1-(123)-123-1234 | 123 123 1234 | 1-800-ALPHNUM
Non-Matches	1.123.123.1234 | (123)-1234-123 | 123-1234
Author	Rating: Igor Kravtsov

Title	Test Details Pattern Title
Expression	^\s*[a-zA-Z,\s]+\s*$
Description	Any Expression Upper/Lower Case, with commas and space between the text, with any amount of space before or after
Matches	Smith, Ed | Ed Smith | aBcDeFgH
Non-Matches	a123 | AB5 | Mr. Ed
Author	Rating: Not yet rated. Mart Maasikas

Title	Test Details Pattern Title
Expression	\d{4}-?\d{4}-?\d{4}-?\d{4}
Description	Major credit card validator. Only checks that the format is 16 digits (optionally separated by hyphens), not the value of any of the digits.
Matches	1234-1234-1234-1234 | 1234123412341234
Non-Matches	1234123412345
Author	Rating: Steven Smith

Title	Test Details Pattern Title
Expression	[\w-]+@([\w-]+\.)+[\w-]+
Description	Yet another simple email validator expression.
Matches	[email protected] | [email protected]
Non-Matches	asdf | 1234
Author	Rating: Steven Smith

Title	Test Details Pattern Title
Expression	((\(\d{3}\) ?)|(\d{3}-))?\d{3}-\d{4}
Description	US Phone Number -- doesn't check to see if first digit is legal (not a 0 or 1).
Matches	(123) 456-7890 | 123-456-7890
Non-Matches	1234567890
Author	Rating: Not yet rated. Steven Smith

Title	Test Details Pattern Title
Expression	^([0-1][0-9]|[2][0-3]):([0-5][0-9])$
Description	Matches a string if it is a valid time in the format of HH:MM
Matches	02:04 | 16:56 | 23:59
Non-Matches	02:00 PM | PM2:00 | 24:00
Author	Rating: Not yet rated. Koen Hoorelbeke

Title	Test Details Pattern Title
Expression	^[0,1]?\d{1}\/(([0-2]?\d{1})|([3][0,1]{1}))\/(([1]{1}[9]{1}[9]{1}\d{1})|([2-9]{1}\d{3}))$
Description	This expression checks the validity of a date (US, but it is easily editable for other format's). Year's 1990-9999, Month's 1 or 01 to 12, Day's 1 or 01 to 31. Still needs to have individual months added (i.e., Feb's 28 days), and some how to check for leap year...the months issue should not be to hard, but the leap year seems like a real chore. Please let me know if you have any suggestions for leap year.
Matches	01/01/1990 | 12/12/9999 | 3/28/2001
Non-Matches	3-8-01 | 13/32/1001 | 03/32/1989
Author	Rating: Scott Watermasysk

Title	Test Details Pattern Title
Expression	((\(\d{3}\)?)|(\d{3}))([\s-./]?)(\d{3})([\s-./]?)(\d{4})
Description	US Phone number that accept a dot, a space, a dash, a forward slash, between the numbers. Will Accept a 1 or 0 in front. Area Code not necessary
Matches	1.2123644567 | 0-234.567/8912 | 1-(212)-123 4567
Non-Matches	0-212364345 | 1212-364,4321 | 0212\345/6789
Author	Rating: Not yet rated. Mart Maasikas

Title	Test Details Pattern Title
Expression	^(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{4,8}$
Description	Password matching expression. Password must be at least 4 characters, no more than 8 characters, and must include at least one upper case letter, one lower case letter, and one numeric digit.
Matches	asD1 | asDF1234 | ASPgo123
Non-Matches	asdf | 1234 | ASDF12345
Author	Rating: Steven Smith

Title	Test Details Pattern Title
Expression	^(?=.*\d).{4,8}$
Description	Password expression. Password must be between 4 and 8 digits long and include at least one numeric digit.
Matches	1234 | asdf1234 | asp123
Non-Matches	asdf | asdf12345 | password
Author	Rating: Not yet rated. Steven Smith

Title	Test Details Pattern Title
Expression	^[-+]?\d*\.?\d*$
Description	Matches any floating point numer/numeric string, including optional sign character (+ or -). Also matches empty strings.
Matches	123 | +3.14159 | -3.14159
Non-Matches	abc | 3.4.5 | $99.95
Author	Rating: Not yet rated. Steven Smith

Title	Test Details Pattern Title
Expression	^\d*\.?\d*$
Description	Matches any unsigned floating point number/numeric string. Also matches empty strings.
Matches	123 | 3.14159 | .234
Non-Matches	abc | -3.14159 | 3.4.2
Author	Rating: Not yet rated. Steven Smith

Title	Test Details Pattern Title
Expression	^[-+]?\d*$
Description	Matches any integer number or numeric string, including positive and negative value characters (+ or -). Also matches empty strings.
Matches	123 | -123 | +123
Non-Matches	abc | 3.14159 | -3.14159
Author	Rating: Steven Smith

Title	Test Details Pattern Title
Expression	^\d*$
Description	Accepts an unsigned integer number. Also matches empty strings.
Matches	123 | 000 | 43
Non-Matches	asbc | -34 | 3.1415
Author	Rating: Not yet rated. Steven Smith

Title	Test Details Pattern Title
Expression	^.{4,8}$
Description	Matches any string between 4 and 8 characters in length. Limits the length of a string. Useful to add to password regular expressions.
Matches	asdf | 1234 | asdf1234
Non-Matches	asd | 123 | asdfe12345
Author	Rating: Not yet rated. Steven Smith

Title	Test Details Pattern Title
Expression	^((4\d{3})|(5[1-5]\d{2})|(6011))-?\d{4}-?\d{4}-?\d{4}|3[4,7]\d{13}$
Description	Matches major credit cards including: Visa (length 16, prefix 4), Mastercard (length 16, prefix 51-55), Discover (length 16, prefix 6011), American Express (length 15, prefix 34 or 37). All 16 digit formats accept optional hyphens (-) between each group of four digits.
Matches	6011-1111-1111-1111 | 5423-1111-1111-1111 | 341111111111111
Non-Matches	4111-111-111-111 | 3411-1111-1111-111 | Visa
Author	Rating: Steven Smith