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Never under estimate the performance of the regex engine.

#! perl -slw use strict; use List::Util qw[ reduce ]; use Benchmark qw[ cmpthese ]; our $str; sub TedP { my ($c, $maxn, $n, $maxc) = ('', 0); for (0..(length($str)-1)) { $_ = substr($str, $_, 1); if ($_ ne $c) { $n = 1; $c = $_; } else { $n++; if ($n > $maxn) { $maxn = $n; $maxc = $c; } } } return $maxc x $maxn; } sub regex { return reduce{ length $a > length $b ? $a : $b } $str =~ m[((.)\2+)]g; } for my $n ( 1 .. 6 ) { $str = join'', map{chr(65+rand(26)) x int(rand 20) } 1 .. 10**$n; print "\nString length ", length $str; # print regex(); # print TedP(); cmpthese -1, { TedP=> \&TedP, Regex=> \&regex }; } __END__ C:\test>551038 String length 89 Rate TedP Regex TedP 12429/s -- -50% Regex 24837/s 100% -- String length 939 Rate TedP Regex TedP 1265/s -- -51% Regex 2598/s 105% -- String length 9741 Rate TedP Regex TedP 126/s -- -48% Regex 242/s 92% -- String length 94791 Rate TedP Regex TedP 12.6/s -- -43% Regex 22.3/s 77% -- String length 949396 (warning: too few iterations for a reliable count) (warning: too few iterations for a reliable count) Rate TedP Regex TedP 1.29/s -- -40% Regex 2.16/s 67% -- String length 9496562 (warning: too few iterations for a reliable count) (warning: too few iterations for a reliable count) s/iter TedP Regex TedP 7.72 -- -39% Regex 4.74 63% --

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
Lingua non convalesco, consenesco et abolesco. -- Rule 1 has a caveat! -- Who broke the cabal?
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

In reply to Re^2: Longest possible run of a single character by BrowserUk
in thread Longest possible run of a single character by srdst13

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