Beefy Boxes and Bandwidth Generously Provided by pair Networks
Syntactic Confectionery Delight
 
PerlMonks  

Re: Comparing strings case insensitive

by sgifford (Prior)
on Sep 12, 2008 at 22:25 UTC ( #711028=note: print w/ replies, xml ) Need Help??


in reply to Comparing strings case insensitive

lc is much faster, it seems to me, though both are very fast (each of these tests below is for 1m comparisons, so regexp had 150K/s, and lc 1830K/s).

Benchmark: timing 10 iterations of RegExp, lc... RegExp: 66 wallclock secs (66.20 CPU) @ 0.15/s (n=10) lc: 6 wallclock secs ( 5.47 CPU) @ 1.83/s (n=10)
#!/usr/bin/perl use warnings; use strict; use Benchmark; use constant SIZE => 1000; our @a1 = map { "a".$_ } (1..SIZE); our @a2 = map { "A".$_ } (1..SIZE); sub use_re { my $count = 0; foreach my $i (@a1) { foreach my $j (@a2) { if ($i =~ /^\Q$j\E$/i) { $count++; } } } die unless $count == SIZE; } sub use_lc { my $count = 0; foreach my $i (@a1) { foreach my $j (@a2) { if (lc $i eq lc $j) { $count++; } } } die unless $count == SIZE; } timethese(10, { RegExp => \&use_re, lc => \&use_lc, });


Comment on Re: Comparing strings case insensitive
Select or Download Code

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://711028]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others taking refuge in the Monastery: (16)
As of 2014-12-19 18:35 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    Is guessing a good strategy for surviving in the IT business?





    Results (91 votes), past polls