Validaciones (Regex)

Regex (Clase)

http://msdn.microsoft.com/es-es/library/system.text.regularexpressions.regex%28v=vs.110%29.aspx

Best Practices for Regular Expressions in the .NET Framework

http://msdn.microsoft.com/en-us/library/gg578045%28v=vs.110%29.aspx

How to: Verify that Strings Are in Valid Email Format

http://msdn.microsoft.com/en-us/library/01escwtf%28v=vs.110%29.aspx