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Common Regular Expressions

Application	Expression	Format Samples	Description
Name	^[a-zA-Z''-'\s]{1,40}$	John Doe O'Dell	Validates a name. Allows up to 40 uppercase and lowercase characters and a few special characters that are common to some names. You can modify this list.
Social security number	^\d{3}-\d{2}-\d{4}$	111-11-1111	Validates the format, type, and length of the supplied input field. The input must consist of 3 numeric characters followed by a dash, then 2 numeric characters followed by a dash, and then 4 numeric characters.
Phone number	^[01]?[- .]?(\([2-9]\d{2}\)|[2-9]\d{2})[- .]?\d{3}[- .]?\d{4}$	(425) 555-0123 425-555-0123 425 555 0123 1-425-555-0123	Validates a U.S. phone number. It must consist of 3 numeric characters, optionally enclosed in parentheses, followed by a set of 3 numeric characters and then a set of 4 numeric characters.
Email	^(?("")("".+?""@)|(([0-9a-zA-Z]((\.(?!\.))| [-!#\$%&'\*\+/=\?\^`\{\}\|~\w])*) (?<=[0-9a-zA-Z])@)) (?(\[)(\[(\d{1,3}\.){3}\d{1,3}\])| (([0-9a-zA-Z][-\w]*[0-9a-zA-Z]\.)+[a-zA-Z]{2,6}))$	someone@example.com	Validates an e-mail address.
URL	^(ht|f)tp(s?)\:\/\/[0-9a-zA-Z]([-.\w]*[0-9a-zA-Z]) *(:(0-9)*)*(\/?)([a-zA-Z0-9\-\.\?\,\'\/\\\+&amp;%\$#_]*)?$	http://www.microsoft.com	Validates a URL
Zipcode	^(\d{5}-\d{4}|\d{5}|\d{9})$|^([a-zA-Z]\d[a-zA-Z] \d[a-zA-Z]\d)$	12345	Validates a U.S. ZIP Code. The code must consist of 5 or 9 numeric characters.
Password	(?!^[0-9]*$)(?!^[a-zA-Z]*$)^([a-zA-Z0-9]{8,10})$		Validates a strong password. It must be between 8 and 10 characters, contain at least one digit and one alphabetic character, and must not contain special characters.
Non- negative integer	^\d+(\.\d\d)?$	0 986	Validates that the field contains an integer greater than zero.
Currency (non- negative)	^(-)?\d+(\.\d\d)?$	1.20	Validates for a positive or negative currency amount. If there is a decimal point, it requires 2 numeric characters after the decimal point.
IP Address	\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b	999.999.999.999	Validate IP addresses.

(source: How To: Use Regular Expressions to Constrain Input in ASP.NET, MSDN; regular-expression.info)