Test for Illegal Characters

Use this fast function to test for the occurrence of nonalphanumeric characters in a string:

 Private Declare Function StrSpn Lib "SHLWAPI" Alias _	"StrSpnW" (ByVal psz As Long, ByVal pszSet As Long) As LongPublic Function IsAlphaNum(ByVal sString As String) As Boolean	Dim lPos As Long	Const ALPHA_NUM As String = "abcdefgihjklmnopqrstuvwxyz" & _		"ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890"	' Returns the first occurrence of nonmatching characters	lPos = StrSpn(StrPtr(pString), StrPtr(pAlphaNum))	' If the return position is not equal to the length of the 	' input string, nonalphanumeric chars were found.	IsAlphaNum = (lPos = Len(sString))End Function

You can easily modify this function to scan for invalid characters by editing the ALPHA_NUM constant so it includes only characters you consider legal.

Editor’s Note: The StrSpn function relies on the version of shlwapi.dll that ships with Internet Explorer 4.0 and later. Handle errors?and expectations?accordingly.

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