How to: Strip Invalid Characters from a String

How to: Strip Invalid Characters from a String 

The following code example uses the static Regex.Replace method to strip invalid characters from a string. You can use the CleanInput method defined here to strip potentially harmful characters that have been entered into a text field in a form that accepts user input. CleanInput returns a string after stripping out all nonalphanumeric characters except @, - (a dash), and . (a period).


    Function CleanInput(strIn As String) As String
        ' Replace invalid characters with empty strings.
        Return Regex.Replace(strIn, "[^\w\.@-]", "")
    End Function

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