Never would have thought of that! It yeilds another nice chunk of savings in the real application:

C:\test>\perl22\bin\perl 1176081.pl -WIDTH=1000 -HEIGHT=1000
yr() took 2.551594
buk() took 1.068262
buk2() took 0.681494
buk3() took 0.167000
dave() took 0.127978

[download]

Thanks.

On a related note: Any ideas why this: 

    while( substr( $$str, $y * $WIDTH, $WIDTH ) =~ m[((.)\2*)]mg ) {
    ...

[download]

Works (runs to completion, produces the desired results) on 5.10.1, but silently loops forever in 5.22.0?

This works in 5.22.0:

        my $ref = \substr( $$str, $y * $WIDTH, $WIDTH );
        while( $$ref  =~ m[((.)\2*)]mg ) {

[download]
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In reply to Re^2: Faster regex to split a string into runs of similar characters? by BrowserUk
in thread Faster regex to split a string into runs of similar characters? by BrowserUk

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