Quick reference for regular expressions

Syntax:

Regex regex = new Regex(@"
^                   # anchor at the start
(?=.*\d)        # must contain at least one numeric character
(?=.*[a-z])    # must contain one lowercase character
(?=.*[A-Z])  # must contain one uppercase character
.{8,10}         # From 8 to 10 characters in length
\s                  # allows a space
$                  # anchor at the end",
RegexOptions.IgnorePatternWhitespace);

Code example:

   1:    public static string emailPattern = 

   2:            @"\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"; 

   3:    public static bool IsEmail(string email)

   4:    {

   5:       if (email != null) return Regex.IsMatch(email, emailPattern);

   6:       else return false;

   7:    }

Reference:

URL

Field	Expression	Format Samples
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.
Name	^[a-zA-Z''-'\s]{1,40}$	John Doe O'Dell
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.
Social Security Number	^\d{3}-\d{2}-\d{4}$	111-11-1111
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.
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 an e-mail address.
E-mail	^([0-9a-zA-Z]([-\.\w]*[0-9a-zA-Z])*@([0-9a-zA-Z][-\w]*[0-9a-zA-Z]\.)+[a-zA-Z]{2,9})$	me@example.com
Validates a URL
^(ht|f)tp(s?)\:\/\/[0-9a-zA-Z]([-.\w]*[0-9a-zA-Z])*(:(0-9)*)*(\/?)([a-zA-Z0-9\-\.\?\,\'\/\\\+&%\$#_]*)?$	http://www.msn.com	Validates a URL
Validates a U.S. ZIP Code. The code must consist of 5 or 9 numeric characters.
ZIP Code	^(\d{5}-\d{4}|\d{5}|\d{9})$|^([a-zA-Z]\d[a-zA-Z] \d[a-zA-Z]\d)$	12345
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.
Password	(?!^[0-9]*$)(?!^[a-zA-Z]*$)^([a-zA-Z0-9]{8,10})$
Validates that the field contains an integer greater than zero.
Non- negative integer	^\d+$	0 986
Validates a positive currency amount. If there is a decimal point, it requires 2 numeric characters after the decimal point. For example, 3.00 is valid but 3.1 is not.
Currency (non- negative)	^\d+(\.\d\d)?$	1.00
Validates for a positive or negative currency amount. If there is a decimal point, it requires 2 numeric characters after the decimal point.
Currency (positive or negative)	^(-)?\d+(\.\d\d)?$	1.20