Re^2: Trimming whitespaces methods

Your method seems to be the quickest so far :-)

use strict;
use warnings;

use Benchmark q{cmpthese};

my @arr = ( q{   fdsgehw fw wwfe w    } ) x 5000;

cmpthese(
   -5,
   {
       alternation   => sub
          {
              my @new = @arr;
              s{ ^\s* | \s*$ }{}gx for @new;
          },
       capture       => sub
          {
              my @new = @arr;
              s{ ^\s* (\S.*?) \s*$ }{$1}x for @new;
          },
       splitJoin     => sub
          {
              my @new = @arr;
              $_ = join q{ }, split for @new;
          },
       twoStage      => sub
          {
              my @new = @arr;
              s{ ^\s* }{}x for @new;
              s{ \s*$ }{}x for @new;
          },
       twoStageComma => sub
          {
              my @new = @arr;
              s{ ^\s* }{}x, s{ \s*$ }{}x for @new;
          },
   },
   );
[download]

                Rate     capture alternation   twoStage twoStageComma 
+ splitJoin
capture       8.93/s          --        -27%       -51%          -52% 
+      -66%
alternation   12.2/s         36%          --       -33%          -34% 
+      -53%
twoStage      18.2/s        104%         49%         --           -2% 
+      -31%
twoStageComma 18.6/s        108%         52%         2%            -- 
+      -29%
splitJoin     26.2/s        193%        115%        44%           41% 
+        --
[download]

It is also compacting multiple spaces within the string, which is a side-effect you might not want.

Cheers,

JohnGG

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Re^3: Trimming whitespaces methods by jwkrahn (Abbot) on Jun 30, 2008 at 23:02 UTC
If you try the same benchmark with the `+` modifier instead of the *``** modifier you will see which is truely fastest: Read more... (1279 Bytes) Rate alternation* capture alternation+ twoStage* twoS +tageComma* splitJoin twoStage+ twoStageComma+ alternation* 29.8/s -- -1% -18% -34% + -35% -44% -65% -66% capture 30.2/s 1% -- -17% -33% + -34% -43% -64% -66% alternation+ 36.4/s 22% 20% -- -20% + -21% -31% -57% -59% twoStage* 45.3/s 52% 50% 24% -- + -1% -15% -46% -48% twoStageComma* 45.9/s 54% 52% 26% 1% + -- -13% -46% -48% splitJoin 53.1/s 78% 76% 46% 17% + 16% -- -37% -40% twoStage+ 84.6/s 184% 180% 132% 87% + 84% 59% -- -4% twoStageComma+ 87.8/s 194% 191% 141% 94% + 91% 65% 4% -- [download]	[reply] [d/l] [select]

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Re^3: Trimming whitespaces methods
by jwkrahn (Abbot) on Jun 30, 2008 at 23:02 UTC

If you try the same benchmark with the + modifier instead of the * modifier you will see which is truely fastest:

Read more... (1279 Bytes)

                 Rate alternation* capture alternation+ twoStage* twoS
+tageComma* splitJoin twoStage+ twoStageComma+
alternation*   29.8/s           --     -1%         -18%      -34%     
+      -35%      -44%      -65%           -66%
capture        30.2/s           1%      --         -17%      -33%     
+      -34%      -43%      -64%           -66%
alternation+   36.4/s          22%     20%           --      -20%     
+      -21%      -31%      -57%           -59%
twoStage*      45.3/s          52%     50%          24%        --     
+       -1%      -15%      -46%           -48%
twoStageComma* 45.9/s          54%     52%          26%        1%     
+        --      -13%      -46%           -48%
splitJoin      53.1/s          78%     76%          46%       17%     
+       16%        --      -37%           -40%
twoStage+      84.6/s         184%    180%         132%       87%     
+       84%       59%        --            -4%
twoStageComma+ 87.8/s         194%    191%         141%       94%     
+       91%       65%        4%             --
[download]

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