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Re^2: I heart Perl

by chargrill (Parson)
on Feb 15, 2006 at 16:17 UTC ( #530430=note: print w/replies, xml ) Need Help??

in reply to Re: I heart Perl
in thread I heart Perl

I'm still puzzling through how japhy got from perlre's definition of (?{ ... }) to his use of it... but I can at least demonstrate what's happening.

I've simplified the string a little, as japhy's regex eliminates whitespace, but the meat of what's happening is this:

$string = 'ShELoVeSMeshElOvEsmeNOtsHeloVeSMEShELOVESmeNOTShEloVesmEShe +LovesMenoTsHELovEsMESHelOVeSmEnotSHeLOVeSMESHElOvESMENotSHeLoVesmEShE +LovEsmENOTsHELOVEsmEsHELOveSMeNoTshELOVeSmesHElOVesmEnOTSheLOvEsMeshE +LoVESmEnoTSHELOvEsM'; @strings = $string =~ /\w{8}/g; for( @strings ){ @string = split //; $bit = ""; for( @string ){ if( 'a' lt $_ ){ $bit .= '1' } else{ $bit .= '0' } } $letter = pack "B8", $bit; print "string: $_ bit: $bit letter: $letter\n"; }

I've left the print statement so the reader can better see the translation.

Output (truncated):

string: ShELoVeS bit: 01001010 letter: J string: MeshElOv bit: 01110101 letter: u string: EsmeNOts bit: 01110011 letter: s string: HeloVeSM bit: 01110100 letter: t string: EShELOVE bit: 00100000 letter: ...

Very nice! This will certainly inspire me to wrap my head around this use of (?{...}) a bit better. Or a lot better :)

$/ = q#(\w)# ; sub sig { print scalar reverse join ' ', @_ } + sig map { s$\$/\$/$\$2\$1$g && $_ } split( ' ', ",erckha rlPe erthnoa stJu +" );

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[Corion]: LanX: Yes, that's the main problem - you have lots (and lots) of workarounds in various places and stages of the processing, and to clean that mess up requires action across the complete codebase. And it's almost impossible to do it piece-by-piece

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