Mask for input field of varied size with windows forms

You can use the System.Text.RegularExpressions; namespace to generate a rule and calculate it where you want.

I created a very simple example to exemplify the use of class Regex , where I run the rule inside a click event, to show the use of the rule. Follow Image below:

Asyoucanseequitesimply,knowingthenamespacebetteryouwillseethatthepossibilitiesarenumerous.

• CPF:"^(\d{3}.\d{3}.\d{3}-\d{2})|(\d{11})$"
• Zip Code: ^\d{5}-\d{3}$
• EMAIL: "^[A-Za-z0-9](([_\.\-]?[a-zA-Z0-9]+)*)@([A-Za-z0-9]+)(([\.\-]?[a-zA-Z0-9]+)*)\.([A-Za-z]{2,})$"

Rule used in the example:

Regex regra = new Regex(@"^[A-Za-z0-9](([_\.\-]?[a-zA-Z0-9]+)*)@([A-Za-z0-9]+)(([\.\-]?[a-zA-Z0-9]+)*)\.([A-Za-z]{2,})$");