Hello Monks

I had to bump the version in a number of files; as it was too many to do by hand I thought I could handle it in a oneliner.

Spoiler alert: I did get it worked out with a oneliner (at the end), but I'm flummoxed to no end as to why my first attempt was not working. Can anyone give me any clues to what I was doing wrong?

Here are my wrong initial attempts (and their output), the first one is probably the most puzzling, if $version is undef, where did "version '1.2.36'" come from?!?:

printf "foo\nversion   '1.2.36'\nbaz\n" | perl -MData::Dumper -pi -e "
+next unless /version/; ($version) = /version\s+('1\.2\.36')/; print $
+version"

    foo
    version   '1.2.36'
    version   '1.2.36'
    baz

printf "foo\nversion   '1.2.36'\nbaz\n" | perl -MData::Dumper -pi -e "
+next unless /version/; ($version) = /version\s+('1\.2\.36')/; print D
+umper $version"
 
    foo
    version   '1.2.36'
    baz

printf "foo\nversion   '1.2.36'\nbaz\n" | perl -MData::Dumper -pi -e "
+next unless /version/; ($version) = /version\s+('1\.2\.36')/; print D
+umper \$version"

    foo
    $VAR1 = undef;
    version   '1.2.36'
    baz

printf "foo\nversion   '1.2.36'\nbaz\n" | perl -pi -e 'next unless /ve
+rsion/; ($version) = $_ =~ m{ version \s+ ''(1[.]2[.]36)'' }xms; prin
+t "version:" . $version . "\n"'

    foo
    version:
    version   '1.2.36'
    baz
[download]

Now of course, doing this in a script works:

$ cat wtf.pl
#!/usr/bin/perl
use 5.010;
use strict;
use warnings;

while (<>) {
  next unless /version/;
  my ($version) = /version \s+ '(\d+[.]\d+[.]\d+)'/msx;
  say $version;
}

$ printf "foo\nversion   '1.2.36'\nbaz\n" | perl wtf.pl
1.2.36
[download]

Epilogue: I did get it figured out, first of all, I only needed to change the last decimal point, so really I only needed to capture the last decimal point. I'm at a loss as to why this one works and my version was unable to match... (but I solved my problem so the issue is at least out of the way) (credit goes to my coworker)

printf "foo\nversion   '1.2.36'\nbaz\n" | perl -pi -e 'if ($_ =~ m/ver
+sion\s+.\d+[.]\d+[.](\d+)/) { my $v1 = quotemeta $1; my $v2 = $1 + 1;
+ $_ =~ s/$v1/$v2/ }'

    foo
    version   '1.2.37'
    baz
[download]

I appreciate any insight that may help me avoid obvious mistakes in the future (although I've driven myself up a wall trying to find any "obvious" mistakes...)

Thanks!

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