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Your code is slower by about a factor of 3:

use Benchmark qw/:all :hireswallclock/; my $DATA = '01 fines name 2222 -P sws -1 reee.tee rrt'; cmpthese(-10, { 'rjt' => q{ $_ = $DATA; s/ (?=.*\s?-1 )/,/g; }, 'pushtaev' => q{ $_ = $DATA; my ( $left, $right ) = split /-1/, $_, 2; $left =~ s/ /,/g; join '-1', $left, $right; }, });
Rate pushtaev rjt pushtaev 1875006/s -- -75% rjt 7582716/s 304% --

Regarding readability, it will depend who you ask in this case. In my experience, I tend to find a simple regex easier to read than tearing apart and piecing a solution back together with split, s///, and join.

Lastly, in your code, replacing this:

    print join '-1', $left, $right;

... with this:

    print $left, '-1', $right;

... resulted in a 32% speed improvement before I/O on your solution (still ~2.2x slower than the straight regex) and puts the terms in their natural order, which is probably more readable than the strange use of join with a delimiter to concatenate three strings.

I hope this is useful feedback to your feedback!

In reply to Re^3: perl substitue till found pattern in aline by rjt
in thread perl substitue till found pattern in aline by Vijay81

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