Perl only cares about pos() for matches with the /g modifier. Drop the /g, and all attempts at matching start from the beginning of the string.

As for the code I provided, well good luck deciphering it. The algorithm I used is pretty complex. The key idea though is for each packet to maintain a hash whose keys are the substrings we are still interested in, and whose values are the set of positions in that packet where the pattern starts. :-)

I don't tend to write production code like that....

In reply to RE (3): Shot myself in the foot with a pos by tilly
in thread Shot myself in the foot with a pos by Guildenstern

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