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Re: Perl: Carriage Return???
- From: Andrew DeFaria <Andrew at DeFaria dot com>
- To: cygwin at cygwin dot com
- Date: Sat, 28 Apr 2007 09:39:49 -0500
- Subject: Re: Perl: Carriage Return???
- References: <679468866@web.de>
Alexander Konig wrote:
Hello
I am reading OŽReilllyŽs "Learning Perl" Book and doing the exercises.
My version of a test script for regular expression was :
?
while( <INPUT> ){
chomp;
if( /$pattern/ ){
print "\nHit: |$`>$&<$'|";
}
else{
if( !$option ){
print "\n\nNo Hit >$pattern< in >$_< !";
}
}
}
?
The output for this code is :
< !Hit >fred< in >Frederic
< !Hit >fred< in >Mr.Smith
|it: |Nar>fred<
I cannot imagine what is going wrong with that. Why some parts are
just overwritten.
The same code using Active Perl works. Some weeks ago this script has
worked using Cygwin, too.
Then, I wanted to check a regular expression with this script I had to
see this weird output.
Could please someone help me. I really love working with Cygwin when
using Windows.
Learn to use the Perl debugger. It's invaluable and teaches you how Perl
works internally as you learn it more. Here's a cheat sheet:
https://defaria.com/blogs/Status/archives/000582.html
Given the above I would do perl -d <your script> then I would have
(c)ontinued to the first if statement and used x $_ to dump out the
contents that variable and probably would have noticed the extra line
feed in that variable. That would have led me to the realization that
DOS style files have both CRs and LFs and that Cygwin's Perl, being more
Unix like than DOS like, only deals with LFs. One solution to this is to:
chomp;
chop if /\r/;
Which will chomp the CR (\n) and chop off the LF (\r) if there is one.
--
Andrew DeFaria <http://defaria.com>
Making music should not be left to the professionals. - Michelle Shocked
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