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I had this problem come up a while back (in fact I think it was my question that prompted the thread on fwp about it . . .). At any rate, this was something I had lying around from it that benchmarks three solutions. You can decide for yourself if the first is cheating or if you really, really care about speed. :)

Also, note that these are returning the length of the common string not the string itself.

#!/usr/bin/perl use Benchmark qw( cmpthese ); use Inline C => <<EOF; int comlen(char *p, char *q) { int i = 0; while( *p && (*p++ == *q++) ) i++; return i; } EOF sub comlen_or { length((($_[0]^$_[1])=~m/^(\0+)/)[0]); } sub comlen_tr { my( $t ); return ($t=$_[0]^$_[1])=~ y/\0/\0/; } $a = "abcdefghijk"; $b = "abcdefg"; cmpthese( shift || 2_000_000, { inline_c => sub { comlen( $a, $b ) }, comlen_or => sub { comlen_or( $a, $b ) }, comlen_tr => sub { comlen_tr( $a, $b ) }, }, ); exit 0;

In reply to Re: Matching bits of 2 strings by Fletch
in thread Matching bits of 2 strings by m2

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