Verifying that a string contains only letters in C# -

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I have an input string and I want to verify that this is in:

  • Only letters or numbers
  • letters and numbers only
  • letters, numbers or underscores only

To clarify, I have 3 in the code There are different cases Calling for different verification What is the easiest way to get it in C #?

characters only: 

  Rexax. IS match (input, @ "^ [a-ja-jade] + $");

Only letters and numbers: 

  Regex.IsMatch (Input, @ "^ [a-zA-Z0-9] + $");

Only letters, numbers, and underscores: 

  Reggae. IS Match (input, @ "^ [A-GAA-G-0-9 _] + $");

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