Hi Luca,

You should consider the fact that 'grep' creates a temporary data structure and that Perl's garbage collection probably won't release it back to the OS (from my experience).

Please consider a simpler way to do what you ask without consuming exessive memory - 

foreach (keys %$a){
        !/le/ and $c->{$_} = $a->{$_};
}

[download]
Note that you can use the same loop for adding more restrictions or perform more actions if you need, which may save you run-time in some cases.

Enjoy,
Mickey

In reply to Re: create hash using grep by mickeyn
in thread create hash using grep by jeanluca

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