Regex converting Binary to ASCII

growlf has asked for the wisdom of the Perl Monks concerning the following question:

Hi folx.

Got an odd one that I am sure is simple - but all the reading of http://www.perldoc.com/perl5.6.1/pod/perlre.html does not clear it up for me.

I am helping a comrade out, and what he wants to do is take a given string that has some ASCII codes in it, convert them to ASCII characters and hand it back. I thought I could do this in a single regex - but so far I seem to be missing something. I also need to state that the ASCII values are in decimal - not hex, wide hex, or oct - and this further confused my as to a solution.

Thank you for any help you give on this.

*G*

Comment on Regex converting Binary to ASCII

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Re: Regex converting Binary to ASCII by jmcnamara (Monsignor) on Mar 19, 2002 at 23:31 UTC
Maybe something like this?: `#!/usr/bin/perl -wl use strict; my $str = 'The ASCII chars 64 and 35'; print $str; $str =~ s/(\d+)/chr $1/eg; print $str; __END__ Prints: The ASCII chars 64 and 35 The ASCII chars @ and #` [download] -- John.	[reply] [d/l]
Re: Re: Regex converting Binary to ASCII by tachyon (Chancellor) on Mar 20, 2002 at 11:55 UTC
You could even add some error checking as ASCII requires that our number be between 0-127 `$str = "Only change valid codes 128 -42 33\n"; print $str; $str =~ s/([+-]?\d+)/ ($1 > 0 and $1 < 128) ? chr $1 : $1 /eg; print $str;` [download] cheers tachyon s&&rsenoyhcatreve&&&s&n.+t&"$'$`$\"$\&"&ee&&y&srve&&d&&print	[reply] [d/l]
Re: Re: Regex converting Binary to ASCII by growlf (Pilgrim) on Mar 19, 2002 at 23:34 UTC
That was it! thanks! G	[reply]
Re: Regex converting Binary to ASCII by lestrrat (Deacon) on Mar 19, 2002 at 22:59 UTC
How are the codes embedded? are they always 3 digit codes ( i.e. 000-255 )? In order to capture the codes, you need some sort of pattern.... which you didn't state once you capture the code, you can then just use chr	[reply]


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