Windows Forms UI Library
Magic User Interface Library. Nice looking and free.
RegEx Examples:
* IsValidEmail - Validating an E-mail Address http://archive.devx.com/devxpress/gurl.asp?i=1X2694710X75356
* IsValidUrl - Validating a URL http://archive.devx.com/devxpress/gurl.asp?i=1X2694710X75357
* IsValidUsPhoneNumber - Validating a US Phone Number http://archive.devx.com/devxpress/gurl.asp?i=1X2694710X75358
* IsValidUsZip - Validating a US ZIP Code http://archive.devx.com/devxpress/gurl.asp?i=1X2694710X75359
* IsValidUsSSN - Validating a US Social Security Number (SSN) http://archive.devx.com/devxpress/gurl.asp?i=1X2694710X75360
* IsValidPath - Validating a System Path http://archive.devx.com/devxpress/gurl.asp?i=1X2694710X75361
* IsValidIP - Validating an IP Address http://archive.devx.com/devxpress/gurl.asp?i=1X2694710X75362