Hi Dave, thank you for your input, the truth of the matter is that I am the victim of earlier poor design. The long string that I am talking about is a list of billing services for a client. All billing service codes are 5 character-long. What I need to do with this list (with a bit of simplification) is to filter in those services that are of use for our purpose, and to sort them out. The ultimate goal is to compare the two large files after having pre-processed them.

In reply to Re^2: Performance problems on splitting long strings by Laurent_R
in thread Performance problems on splitting long strings by Laurent_R

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