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Full Discussion: Combining two perl commands into one
Top Forums Shell Programming and Scripting Combining two perl commands into one Post 303045491 by bedtime on Friday 27th of March 2020 04:35:52 PM
Old 03-27-2020
Combining two perl commands into one
I made a program that extracts quotes while retaining special inner quotes (in this case an 'x' followed by an apostrophe). The original program is far more complicated than this, but I wanted to make it simple to troubleshoot.


I want to take these two perl commands and have the first command's results be piped into the second commands input but while only running perl once:


Input: ['Say, x'Hix'']
Code:
echo "['Say, x'Hix'']" | perl -lne 'push @a,/\[\N{U+0027}(.*?)(?<!x)\N{U+0027}/g; END{print "@a"};'

Output: Say, x'Hix'

Taking the output of the first command:

Code:
echo "Say, x'Hix'" | perl -pe 's/x\N{U+0027}/\N{U+0027}/g; END{print "@a"};'

Result (proper): Say, 'Hi'



I realise that I could easily just run perl twice and pipe them into eachother, but running perl twice seems inefficient; especially given that this command is ran thousands of times:
Code:
echo "['Say, x'Hix'']" | perl -lne 'push @a,/\[\N{U+0027}(.*?)(?<!x)\N{U+0027}/g; END{print "@a"};' |  perl -pe 's/x\N{U+0027}/\N{U+0027}/g; END{print "@a"};'

I've tried combining both commands in the code below, but it doesn't seem to be taking the output of the first command as input for the second:
Code:
echo "['Say, x'Hix'']" | perl -lne 'push @a,/\[\N{U+0027}(.*?)(?<!x)\N{U+0027}/g; END{print "@a"};' -pe 's/x\N{U+0027}/\N{U+0027}/g; END{print "@a"};'

Result (not what I want):

['Say, 'Hi'']
Say, x'Hix'
Say, x'Hix'


Any ideas?
 

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LEARN ABOUT CENTOS

module::install::deprecated

Module::Install::Deprecated(3)				User Contributed Perl Documentation			    Module::Install::Deprecated(3)

NAME

       Module::Install::Deprecated - Warnings and help for deprecated commands

DESCRIPTION

       One of the nicest features of Module::Install is that as it improves, there is no need to take into account user compatibility, because
       users do not need to install Module::Install itself.

       As a result, the Module::Install API changes at a faster rate than usual, and this results in deprecated commands.

       "Module::Install::Deprecated" provides implementations of the deprecated commands, so that when an author is upgrading their
       Module::Install and they are using a deprecated command they will be told that the command has been deprecated, and what the author should
       use instead.

       This extension should NEVER end up bundled into the distribution tarball.

COMMANDS

   c_files
       The "c_files" command has been changed to "cc_files" to reduce confusion and keep all compiler commands within a consistent "ff_foo" naming
       scheme.

   inc_paths
       The "inc_paths" command has been changed to "cc_inc_paths" due to confusion between Perl and C.

   lib_paths
       The "lib_paths" command has been changed to "cc_lib_paths" due to confusion between Perl and C.

   lib_links
       The "lib_links" command has been changed to "cc_lib_links" due to confusion between Perl and C.

   optimize_flags
       The "optimize_flags" command has been changed to "cc_optimize_flags" for consistency reasons.

AUTHORS

       Adam Kennedy <adamk@cpan.org>

SEE ALSO

       Module::Install

COPYRIGHT

       Copyright 2006 Adam Kennedy.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

       See <http://www.perl.com/perl/misc/Artistic.html>

perl v5.16.3							    2012-03-01					    Module::Install::Deprecated(3)
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