如何在vb.net中检查字符串是否包含特殊字符？

Question

I want to check whether the input contains special characters(@"[~`!@#$%^&*()-+=|{}':;.,<>/?]") or not in vb.net?

How can I check that in vb.net code?

Answer 1

If you want to check if any of the mentioned characters are contained in the string you can use the following function:

Function ContainsSpecialChars(s As String) As Boolean
    Return s.IndexOfAny("[~`!@#$%^&*()-+=|{}':;.,<>/?]".ToCharArray) <> -1
End Function

Or if you want to check if the string just contains letters, digits or whitespace, you can use the following function:

Function ContainsSpecialChars(s As String) As Boolean
    Return s.Any(Function(c) Not (Char.IsLetterOrDigit(c) OrElse Char.IsWhiteSpace(c)))
End Function

Answer 2

If the string can only contain letters or digits(0-9) or white-spaces:

Dim noSpecialCharacters = text.
    All(Function(c) Char.IsLetterOrDigit(c) OrElse Char.IsWhiteSpace(c))

Dim containsSpecialCharacters = Not noSpecialCharacters