GetRandom

Generate random string, fully customization, with even deciding what special characters.
Update: New version forcing first letter to be either upper or lower case letter if either is allowed, to prevent having random starting with number.


Public

Tested

My Own Work
Function GetRandom(intMinLen, intMaxLen, UseNumbers, UseUpperCase, UseLowerCase, UseSpcChars,strSpecialchars)
    Dim intLen, strRnd
    If IntMinLen = "" then intMinLen=25
    If IntMinLen = 0 then intMinLen=25
    If IntMaxLen = "" then intMaxLen=25
    If IntMaxLen = 0 then intMaxLen=25
    If UseNumbers = "" then UseNumbers=1
    If UseUpperCase = "" then UseUpperCase=1
    If UseLowerCase = "" then UseLowerCase=1
    If UseSpcChars = "" then UseSpcChars=1
    If strSpecialChars="" then strSpecialChars="#$^*()_-" ' "!@#$%^&*()_+-/\|"
   
    ' Generates a random number with length: iMinLen to iMaxLen (example 20 to 30 long)
    Randomize
strRnd                    = ""
    intLen                    = intMaxLen
    If intMinLen <> intMaxLen then _
        intLen = Int((intMaxLen - intMinLen + 1) * Rnd + intMinLen)
    ' now depending on the length of the password (dependent on the random number generated above), create random characters between a-z, A-Z, 0-9 or one char from the strSpecialChars above by using a for loop
    Do While Len(strRnd) < intLen
        ' Generates a random number: 1, 2, 3, or 4; where
        ' 1 gets a lowercase letter; 2 gets uppercase character, and
        ' 3 gets a number between 0 and 9
        ' 4 gets special characters from strSpecialChars
        Randomize
        intCharType            = Int(4 * Rnd + 1) ' now check if intCharType is 1, 2, 3, or 4
        If strRnd = "" Then ' forcing first letter to be uppercase or lowercase, no number nor special character
            If UseLowerCase = 1 Then intCharType = 1
            If UseUpperCase = 1 Then intCharType = 2
        End If
        Select Case intCharType
        Case 1 ' get a lowercase letter a-z inclusive
            If UseLowerCase = 1 Then
                Randomize
                strRnd        = strRnd & Chr(Int((25 * Rnd) + 97))
            End If
        Case 2 ' get a uppercase letter A-Z inclusive
            If UseUpperCase = 1 Then
                Randomize
                strRnd        = strRnd & Chr(Int((25 * Rnd) + 65))
            End If
        Case 3 ' get a number between 0 and 9 inclusive
            If UseNumbers = 1 Then
                Randomize
                strRnd        = strRnd & Chr(Int((9 * Rnd) + 48))
            End If
        Case 4
            ' get a number between 0 and len(strSpecialChars)
            If UseSpcChars = 1 Then
                Randomize
                strRnd        = strRnd & Mid(strSpecialChars, Int((Len(strSpecialChars) * Rnd) + 1), 1)
            End If
        End Select
    Loop
    GetRandom                = strRnd ' return password
End Function

intMinLen, intMaxLen, UseNumbers, UseUpperCase, UseLowerCase, UseSpcChars,strSpecialchars

Views 4648 Downloads 1403

Classic ASP Texts + Strings
ANmarAmdeen
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Revisions

v2.0