I don't have an answer to your question, bladx, but here's 2 ways that I've done something similar:     cheers,
    Don
    striving for Perl Adept
    (it's pronounced "why-bick")

In reply to Re: Improving the efficiency of this piece of code (slightly OT, somewhat similar approach) by ybiC
in thread Improving the efficiency of this piece of code by bladx

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