c# strginc contains all aplhabetic characters of antoher string : I have two strings like this:

    string longName = "PRODUCT MANAGER OFFICE";
    string shortName = "P.M.O";

I want to validate if longName conains. Short name alphabetic charecters (PMO). The short name may be like this:

 - `string shortName = "PMO";`
 - `string shortName = "pmo";`
 - `string shortName = "pmoff";`

so I want to math string charecters. How can I do this? Should I use regex or another way?


