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Expand strings to a predetermined length?

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I need to expand a string to a predetermined length using a fill character. In this case, I'm reading a CSV file, and I need to take the employee number, which can be anywhere between 3 and 6 characters, and expand it to eight using leading zeros.

My current method uses a Switch statement, but I was wondering if there was a UDF I had overlooked, or a more elegant or clever way to go about it than:

Switch StringLen($empNum[$i])
Case 2
Case 3
Case 4
Case 5
Case 6
Case 7
Case 8

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