c# - How can I validate a string to only allow alphanumeric characters in it? -

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How do I verify a string using regular expressions to allow letters in letters only?

(I do not want to allow any spaces).

Use the expression: 

  ^ [a-zA- Z0- 9] * $

means: using the system. Lesson Regular expression; 

  Regex r = New Reggae ("^ [A-GA-Z0-9] * $"); If (r.IsMatch (SomeString)) {...}

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