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).
Example
Function CleanInput(strIn As String) As String
' Replace invalid characters with empty strings.
Return Regex.Replace(strIn, "[^\w\.@-]", "")
End Function
String CleanInput(string strIn)
{
// Replace invalid characters with empty strings.
return Regex.Replace(strIn, @"[^\w\.@-]", "");
}