How can I check if a string only contains letters?

Question

I\'m using a function that allows me to review a string of text and evaluate if it is composed of letters. It is housed in a module called \"General\". The general module

Answer 1

Why don't you use regular expressions instead? Then there's no loops involved:

Public Function IsAlpha(strValue As String) As Boolean
    IsAlpha = strValue Like WorksheetFunction.Rept("[a-zA-Z]", Len(strValue))
End Function

Also, when you create a User-Defined Function (UDF) you need to ensure that the return value is assigned to the name of the actual function, in this case IsAlpha - not IsLetter otherwise the value will never be passed back.