$ time ./script.pl dict.txt 
Num. Line : 185866729 - Occ : 14900

real    0m39.453s
user    0m38.999s
sys    0m0.445s



$ perl -v

This is perl 5, version 16, subversion 2 (v5.16.2) built for darwin-th
+read-multi-2level
(with 3 registered patches, see perl -V for more detail)

[download]
Mac OS X 10.9.5, Intel Core i7 2.4 GHz, 16 GB RAM 1600 MHz DDR3

You can shove some time off getting rid of $counter and using $. instead, a quick test took about 6 seconds less in my configuration.

perl -ple'$_=reverse' <<<ti.xittelop@oivalf

Io ho capito... ma tu che hai detto?

In reply to Re^4: How to optimize a regex on a large file read line by line ? by polettix
in thread How to optimize a regex on a large file read line by line ? by John FENDER

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