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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	\(([0-9]{2}|0{1}((x|[0-9]){2}[0-9]{2}))\)\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	^[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

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	^\$[0-9]+(\.[0-9][0-9])?$
Description	Validates a dollar amount including a dollar sign and 2 decmals. The decimal and cents are optional.
Matches	$1.50 | $49 | $0.50
Non-Matches	1.5 | $1.333 | this $5.12 fails
Author	Rating: Not yet rated. Bob Levittan

Title	Test Details Pattern Title
Expression	\b(([01]?\d?\d|2[0-4]\d|25[0-5])\.){3}([01]?\d?\d|2[0-4]\d|25[0-5])\b
Description	Most Concise RegExp for matching Decimal IPs. If nothing else, it'll make your code easier to read. (And I know that \d?\d is \d{1,2} but that's 2 extra characters.) --Update: darkone noticed 8 characters could be shaved down. I've edited it to reflect this. Thanks, darkone!
Matches	217.6.9.89 | 0.0.0.0 | 255.255.255.255
Non-Matches	256.0.0.0 | 0978.3.3.3 | 65.4t.54.3
Author	Rating: Sean Schricker

Title	Test Details Pattern Title
Expression	(AUX|PRN|NUL|COM\d|LPT\d)+\s*$
Description	"Be careful when opening or creating files by using Scripting File System Object. If the filename is based on the user's input, the user might attempt to open a serial port or printer."
Matches	COM1 | AUX | LPT1
Non-Matches	image.jpg | index.html | readme.txt
Author	Rating: Not yet rated. Chris Craft

Title	Test Details Pattern Title
Expression	^(user=([a-z0-9]+,)*(([a-z0-9]+){1});)?(group=([a-z0-9]+,)*(([a-z0-9]+){1});)?(level=[0-9]+;)?$
Description	This re was used for a security routine. The format is: [user=name1,name2,...,nameN;][group=group1,group2,...,groupN;][level=number;] Each component is optional, but they must appear the in order listed if applicable.
Matches	user=foo,bar,quux;group=manager,admin;level=100; | group=nobody;level=24;
Non-Matches	user=foo | blahh
Author	Rating: Not yet rated. Michael Scovetta

Title	Test Details Pattern Title
Expression	^\D?(\d{3})\D?\D?(\d{3})\D?(\d{4})$
Description	This RegEx requires a US phone number WITH area code. It is written to all users to enter whatever delimiters they want or no delimiters at all (i.e. 111-222-3333, or 111.222.3333, or (111) 222-3333, or 1112223333, etc...).
Matches	(111) 222-3333 | 1112223333 | 111-222-3333
Non-Matches	11122223333 | 11112223333 | 11122233333
Author	Rating: Laurence O'Donnell

Title	Test Details Pattern Title
Expression	^([\w\d\-\.]+)@{1}(([\w\d\-]{1,67})|([\w\d\-]+\.[\w\d\-]{1,67}))\.(([a-zA-Z\d]{2,4})(\.[a-zA-Z\d]{2})?)$
Description	This pattern allows standard e-mail addresses (e.g. [email protected]), sub domains (e.g. [email protected]), the new two- and four-letter domains (e.g. [email protected] and [email protected]) and country codes (e.g. [email protected]). Also, this patter follows the Network Solutions standard length of 67 characters for top-level domains. The reason I allow numbers to be entered in the domain suffix is for future planning. If you do not want numbers to be able to be added as a domain suffix (e.g. [email protected]), simply delete the last two occurrences of "\d".
Matches	[email protected] | [email protected] | [email protected]
Non-Matches	[email protected] | [email protected] | foo@[email protected]
Author	Rating: Not yet rated. Laurence O'Donnell

Title	Test Details Pattern Title
Expression	^(\d{4}[- ]){3}\d{4}|\d{16}$
Description	Credit card validator. Just checks that the format is either 16 numbers in groups of four separated by a "-" or a " " or nothing at all.
Matches	1234-1234-1234-1234 | 1234 1234 1234 1234 | 1234123412341234
Non-Matches	Visa | 1234 | 123-1234-12345
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

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	^\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