How to restrict single quote after numbers in regular expression

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C#

Javascript

Java

, +

[RegularExpression
("^[a-zA-Z-äöüÄÖÜß]+((['. -][a-zA-Z-äöüÄÖÜß ])?[a-zA-Z-äöüÄÖÜß]*)*$",
ErrorMessage = "Invalid UserName")]
public string FirstName { get; set; }

Ex: San's123 Mon's -> Correct
San's S4's -> Incorrect -> I dont need SingleQuote after number

Can someone help me how to do this

What I have tried:

I tried the above syntax but its allowing single quote after numbers