... for a simple file of 2 Gb it takes 12,6 min ...

Wait... Over 12 minutes to process a 2 GB file in the simple way you've shown?!? I put together a 10,000,000 line file of 200 characters per line, with the last six characters '000000' .. '999999', and processing with your code took just over 20 seconds on my laptop (update: although some later runs took just over 40 seconds). (Generating the file only took about 40 seconds!)

If I understand your 12 minute claim correctly, I have a sneaking suspicion that you're not showing us the code you're actually running. It's important to show real code and not "It's just like as if it was this code..."

Update: If, however, the time is actually on the order of 12 seconds, I honestly don't think you're going to do a great deal better; such a time would seem pretty good to me.

Give a man a fish:  <%-{-{-{-<

In reply to Re: How to optimize a regex on a large file read line by line ? by AnomalousMonk
in thread How to optimize a regex on a large file read line by line ? by John FENDER

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