Just a little note on efficiency...

use Benchmark;

sub a {
    $_ = "this is a\ntest\n";
    s/(?:\s+|\n+)//gc;
}
sub b {
    $_ = "this is a\ntest\n";
    s/\s+//gc;
}
sub c {
    $_ = "this is a\ntest\n";
    tr/\n\r\t //d;
}

timethese(250000,{ a => \&a, b => \&b, c => \&c });


Benchmark: timing 250000 iterations of a, b, c...
         a:  5 wallclock secs ( 4.18 usr +  0.01 sys =  4.19 CPU) @ 59
+665.87/s (n=250000)
         b:  1 wallclock secs ( 1.61 usr +  0.03 sys =  1.64 CPU) @ 15
+2439.02/s (n=250000)
         c:  1 wallclock secs ( 0.66 usr +  0.02 sys =  0.68 CPU) @ 36
+7647.06/s (n=250000)

[download]
All of these have the same effect on the string...

for one... \s includes \n, so the right part of that doesn't ever actually do anything useful, but I believe it still gets checked each time to make sure it doesn't make a better match... I believe in most cases a character class would be better for that, but that is really irrelevant, since stripping single characters is much faster with tr///d

Just thought I would point it out...

                - Ant
                - Some of my best work - (1 2 3)

In reply to Re: Re: Extracting text after a keyword by suaveant
in thread Extracting text after a keyword by Anonymous Monk

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