RandomString – Generate a random string using a mask

' generate a random string'' the mask can contain the following special chars'    ? : any ASCII character (1-127)'    # : a digit'    A : an alphabetic char'    N : an alphanumeric char'    H : an hex char' all other chars are taken literally' Example: a random-generated phone number'   phone = RandomString("(###)-####-####")Function RandomString(ByVal mask As String) As String    Dim i As Integer    Dim acode As Integer    Dim options As String    Dim char As String        ' initialize result with proper lenght    RandomString = mask        For i = 1 To Len(mask)        ' get the character        char = Mid$(mask, i, 1)        Select Case char            Case "?"                char = Chr$(1 + Rnd * 127)                options = ""            Case "#"                options = "0123456789"            Case "A"                options = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"            Case "N"                options = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0" _                    & "123456789"            Case "H"                options = "0123456789ABCDEF"            Case Else                ' don't modify the character                options = ""        End Select            ' select a random char in the option string        If Len(options) Then            ' select a random char            ' note that we add an extra char, in case RND returns 1            char = Mid$(options & Right$(options, 1), 1 + Int(Rnd * Len(options) _                ), 1)        End If                ' insert the character in result string        Mid(RandomString, i, 1) = char    NextEnd Function

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