Mask Extension method for making string masks in CSharp. How to install with Nuget ? dotnet add package Mask How do I use it? "11985644568".ToMasked("(AA) AAAAA-AAAA") Examples of allowed masks mask example (AA) AAAAA-AAAA (11 98564-4568 0000.00 2017.22 999.999.999-99 048.457.987-98 SSSS 2014