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Re: Removing non-printing (hex codes) from text files

by oiskuu (Hermit)
on Feb 06, 2014 at 22:54 UTC ( #1073777=note: print w/replies, xml ) Need Help??

in reply to Removing non-printing (hex codes) from text files

Do you know what encoding these files are using? There are tools to convert from one encoding to another.

If you really need to filter unprintable characters, line by line, then

$\ = "\n"; while (<>) { s/[^[:print:]]//g; print; }
does this, but also converts to unix line endings...

tr/// will be faster, however. Characters \177-\377 aren't ASCII printable, you may want to filter those, too. There's no need to chomp line ends, only to add them back later.

while (<WORK>) { tr/\000-\011\013\014\016-\037\177-\377//d; print $file $_; }

Even better is to specify the good characters, remove anything other. Consider using fixed-length input (avoid arbitrary big line buffers). Finally, you probably want raw binmode to avoid problems with ^Z and so on. See open.

use open IO => ':bytes'; $/ = \4096; ... while (<WORK>) { tr/\012\015\040-\176//cd; print $file $_; }

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[Corion]: Hi Lady_Aleena!
[Lady_Aleena]: Corion, how are things?
[Corion]: Lady_Aleena: Quite good ;) I'm working four days now, instead of five, which helps my mood and my weekends tremendously
[Corion]: My Perl output hasn't recovered, but as $work is still somewhat stressful, I don't think this would be different with a five day workdweek
[Lady_Aleena]: Corion, that is a good thing (TM) 8)
[Corion]: And this evening, I'm actually dusting off some old module of mine and bringing it up to the last version of the library I'm wrapping
[Lady_Aleena]: Updating things can be fun, if there is a better way to do it.

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