That's not true. m/.../ only recompiles if the contents of any interpolated variable has changed. Demo:

use re 'debug';

foreach (qw( abc abc def )) {
   print("==============================\n");
   print("$_\n");
   print("\n");
   /$_/;
}

[download]

Update: Oops, I didn't notice you reversed the loops in addition to moving the regexp.

In reply to Re^2: Slow Regex - How to Optimize by ikegami
in thread Slow Regex - How to Optimize by noslenj123

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