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Title	Test Details Pattern Title
Expression	^[a-zA-Z0-9\-\.]+\.(com|org|net|mil|edu|COM|ORG|NET|MIL|EDU)$
Description	Domain names: This regular expression tests the validity of a domain or hostname. It will match any valid domain name that does not contain characters which are invalid in URLs, and which ends in .com, .org, .net, .mil, or .edu. You can add additional valid TLDs by appending the | (pipe) character and the desired TLD to the list in the parens.
Matches	3SquareBand.com | asp.net | army.mil
Non-Matches	$SquareBand.com | asp/dot.net | army.military
Author	Rating: Not yet rated. G. Andrew Duthie

Title	Test Details Pattern Title
Expression	^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$
Description	Email validator that adheres directly to the specification for email address naming. It allows for everything from ipaddress and country-code domains, to very rare characters in the username.
Matches	[email protected] | [email protected] | [email protected]
Non-Matches	joe | @foo.com | a@a
Author	Rating: Andy 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	[\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{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	^(?=.*\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)(?=.*[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	^(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9])\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[0-9])$
Description	RegExp for validating the format of IP Addresses. This works great with the ASP.NET RegularExpressionValidator server control.
Matches	127.0.0.1 | 255.255.255.0 | 192.168.0.1
Non-Matches	1200.5.4.3 | abc.def.ghi.jkl | 255.foo.bar.1
Author	Rating: G. Andrew Duthie

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	^\d{5}-\d{4}|\d{5}|[A-Z]\d[A-Z] \d[A-Z]\d$
Description	This expression matches three different formats of postal codes: 5 digit US ZIP code, 5 digit US ZIP code + 4, and 6 digit alphanumeric Canadian Postal Code. The first one must be 5 numeric digits. The ZIP+4 must be 5 numeric digits, a hyphen, and then 4 numeric digits. The Canadian postal code must be of the form ANA NAN where A is any uppercase alphabetic character and N is a numeric digit from 0 to 9.
Matches	44240 | 44240-5555 | G3H 6A3
Non-Matches	Ohio | abc | g3h6a3
Author	Rating: Steven Smith

Title	Test Details Pattern Title
Expression	^[2-9]\d{2}-\d{3}-\d{4}$
Description	This expression matches a hyphen separated US phone number, of the form ANN-NNN-NNNN, where A is between 2 and 9 and N is between 0 and 9.
Matches	800-555-5555 | 333-444-5555 | 212-666-1234
Non-Matches	000-000-0000 | 123-456-7890 | 2126661234
Author	Rating: Steven Smith

Title	Test Details Pattern Title
Expression	^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$
Description	This expression matches email addresses, and checks that they are of the proper form. It checks to ensure the top level domain is between 2 and 4 characters long, but does not check the specific domain against a list (especially since there are so many of them now).
Matches	[email protected] | [email protected] | [email protected]
Non-Matches	a@b | notanemail | joe@@.
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 Five Integer US ZIP Code
Expression	^\d{5}$
Description	Matches 5 numeric digits, such as a zip code.
Matches	33333 | 55555 | 23445
Non-Matches	abcd | 1324 | as;lkjdf
Author	Rating: Steven Smith

Title	Test Details One Numeric Digit
Expression	^\d$
Description	Matches exactly 1 numeric digit (0-9).
Matches	1 | 2 | 3
Non-Matches	a | 324 | num
Author	Rating: Steven Smith

Title	Test Details Pattern Title
Expression	/\*[\d\D]*?\*/
Description	If you need to extract or remove any /* */ sytle comments from any Java, JavaScript, C, C++, CSS, etc code you have this regular expression can help.
Matches	/* my comment */ | /* my multiline comment */ | /* my nested comment */
Non-Matches	*/ anything here /* | anything between 2 seperate comments | \* *\
Author	Rating: Chris Craft

Title	Test Details Pattern Title
Expression	^[a-zA-Z]{1,2}[0-9][0-9A-Za-z]{0,1} {0,1}[0-9][A-Za-z]{2}$
Description	Matches UK postcodes according to the following rules 1. LN NLL eg N1 1AA 2. LLN NLL eg SW4 0QL 3. LNN NLL eg M23 4PJ 4. LLNN NLL eg WS14 0JT 5. LLNL NLL eg SW1N 4TB 6. LNL NLL eg W1C 8LQ Thanks to Simon Bell for informing me of LNL NLL rule for postcodes which I had omitted in an earlier version.
Matches	G1 1AA | EH10 2QQ | SW1 1ZZ
Non-Matches	G111 1AA | X10 WW | DDD 5WW
Author	Rating: Not yet rated. Dave Sparks

Title	Test Details Pattern Title
Expression	^[\w\.=-]+@[\w\.-]+\.[\w]{2,3}$
Description	Much simpler email expression. This one forces a length of 2 or 3, which fits current specs, but you may need to alter the end as this one allows all numerals on the .COM section.
Matches	[email protected] | [email protected] | [email protected]
Non-Matches	word | word@ | @word
Author	Rating: Gregory Beamer