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YouTube-style ID numbers

YouTube-style ID numbers are typically generated as unique, short, and alphanumeric strings that are URL-safe. Here's an ASP function that generates such IDs:

How It Works:
Character Set: The chars variable contains a set of URL-safe characters (a-z, A-Z, 0-9, -, _).
Random Length: The ID is set to a fixed length of 11 characters, mimicking YouTube's style.
Random Generation: For each character in the ID, a random index is generated to pick a character from the chars string.
Output: The function concatenates the selected characters to form a unique string.

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<%
Function GenerateYouTubeID()
    Dim chars, idLength, id, i, randomIndex
    ' Define the characters allowed in the ID
    chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_"
    idLength = 11 ' Standard YouTube ID length is 11 characters
    id = ""

    ' Generate a random ID
    Randomize ' Initialize the random number generator
    For i = 1 To idLength
        randomIndex = Int((Len(chars) * Rnd) + 1) ' Random index from 1 to length of chars
        id = id & Mid(chars, randomIndex, 1) ' Append the random character
    Next

    GenerateYouTubeID = id
End Function

' Example usage
Dim newYouTubeID
newYouTubeID = GenerateYouTubeID()
Response.Write("Generated YouTube ID: " & newYouTubeID)
%>