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Limit string to just specific characters.

Summary:	There are many reasons to limit a string to just specific characters. Here's one way of doing that.

Keywords:	ALPHA ASP CHAR CHARACTERS LOGIN NUMERIC VB
Applicable Software:	Active Server Pages (ASP) Visual Basic 6

Body:	For login names, it's generally a good idea to only allow particular characters. Namely, alphanumeric characters, underscore (_), hyphens (-) and periods (.). Anything else and you'll never know what people will enter. Function Validated(psString) Dim sReturn, iCounter, sChar Dim sValid sValid = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_-." For iCounter = 1 To Len(psString) sChar = Mid(psString, iCounter, 1) If InStr(1, sValid, sChar) > 0 Then sReturn = sReturn & sChar End If Next Validated = sReturn End Function To use it, you would do: Dim sLogin, sLoginFixed sLogin = "Doug's 1 Test" sLoginFixed = Validated(sLogin) Response.Write sLoginFixed 'Will return: Dougs1Test

Author:	Craig Hawker
Posted On:	1/3/2003 5:50:59 AM

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