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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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[ovedpo15]: Im not allowed to use additional modules, so I can't use it. looking for a simple regex to do this task though..
[Corion]: Ah, so this is homework? Then most likely, you should review your course material closer. It would greatly surprise me if the course material wouldn't mention the topics that will be used in the homework...
[Corion]: I already showed you the simple regex to match the last part of a string without a comma in it
[Tux]: Corion++ hippo++
[ovedpo15]: it isn't homework. its a module I use at work. The process to add additional module isn't worth it. p.s never heard a university course which teach perl
[marto]: there are many, to this day.
[ovedpo15]: @Corion Yes I use the regex you showed me. its very good regex. although now i need to know that substring unit that comma
marto mad corrections to one around 18 months ago
[ovedpo15]: my code checks the value after that comma, if it isn't valid it will remove it. so I would like to remove the substring after that comma meaning getting the string before comma.
[hippo]: Are you sure that Text::CSV_XS isn't already installed at your work? It's such a useful module that it might well be there.

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