BIGmiralli
Frequent Poster
Joined: 17 Apr 2007
Posts: 38
Location: Boston, Massachusetts
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 Posted: Fri May 23, 2008 8:52 am Post subject: Test a string for an alphanumeric value |
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Question: In Access, I want to know if a string value contains alphanumeric characters only. How can I do this?
Answer: To accomplish this, you need to create a custom function.
You'll need to open your Access database and create a new module.
Then paste into the new module the following function:
| Code: | Function AlphaNumeric(pValue) As Boolean
Dim LPos As Integer
Dim LChar As String
Dim LValid_Values As String
'Start at first character in pValue
LPos = 1
'Set up values that are considered to be alphanumeric
LValid_Values = " abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ+-.0123456789"
'Test each character in pValue
While LPos <= Len(pValue)
'Single character in pValue
LChar = Mid(pValue, LPos, 1)
'If character is not alphanumeric, return FALSE
If InStr(LValid_Values, LChar) = 0 Then
AlphaNumeric = False
Exit Function
End If
'Increment counter
LPos = LPos + 1
Wend
'Value is alphanumeric, return TRUE
AlphaNumeric = True
End Function |
The AlphaNumeric function will return TRUE if all of the values in the string are alphanumeric. Otherwise, it will return FALSE.
You can use the AlphaNumeric function as follows:
AlphaNumeric("6.49") would return TRUE
AlphaNumeric("^Tech on the Net ") would return FALSE
AlphaNumeric("hi~there") would return FALSE
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