Hi haukex,

You might want to also try using a file handle opened on a reference to your string: 

    filehandle => sub {
        my @lines;
        open my $str_fh, "<", \$str or die "cannot open fh $!";
        while (<$str_fh>) {
            chomp;
            s/o/i/g;
            push @lines, $_;            
        }
    },

[download]
This appears to be faster than your other subs, including the one with split (note that I had to change the count value for the result to be meaningful): 
$ perl bench_split.pl
           s/iter      regex      index      split filehandle
regex        3.44         --        -9%       -36%       -48%
index        3.13        10%         --       -29%       -43%
split        2.21        56%        42%         --       -19%
filehandle   1.78        93%        76%        24%         --

[download]

In reply to Re: Is foreach split Optimized? by Laurent_R
in thread Is foreach split Optimized? (Update: No.) by haukex

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