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Tip of the Day
Language: VB7
Expertise: Intermediate
Apr 20, 2002

WEBINAR:

On-Demand

Application Security Testing: An Integral Part of DevOps


ValidateVBName - Check a variable's or procedure's name

' Return True if a string is a valid name for a Visual Basic variable or 
' procedure.
' This function turns to be useful when writing add-ins that generate code.
' The optional argument specifies whether the dot character is accepted.

Function ValidateVBName(ByVal VBName As String, Optional ByVal acceptDots As _
    Boolean = False) As Boolean
    Dim i As Long

    ' reject null strings or strings that are too long
    If VBName Is Nothing OrElse VBName.Length = 0 OrElse VBName.Length > 255 _
        Then
        Exit Function
    ElseIf VBName.IndexOf("..") >= 0 Then
        ' two consecutive dots aren't valid
        Exit Function
    End If

    ' create the regular expression
    ' note that ^ is the beginning of string, $ is end of string
    Dim pattern As String = "^[A-Z_][A-Za-z0-9_]*$"
    If acceptDots Then
        pattern = "^[A-Z_][A-Za-z0-9_.]*$"
    End If
    Dim re As New Text.RegularExpressions.Regex(pattern, _
        Text.RegularExpressions.RegexOptions.IgnoreCase)

    ' return True if it is a perfect match
    Return re.IsMatch(VBName)

End Function
Francesco Balena
 
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