Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl: the Markov chain saw
 
PerlMonks  

Re: Strange YAML behavior with lists of qr regexp values

by Anonymous Monk
on Jan 28, 2013 at 18:33 UTC ( #1015745=note: print w/ replies, xml ) Need Help??


in reply to Strange YAML behavior with lists of qr regexp values

It doesn't seem to have anything to do with the adding of new patters.

Instead, YAML::Syck's LoadFile() function seems to always add a level of brackets around all regexes it reads from a YAML file, even if they already have outer brackets.

Example:

test-re.pl:

#!/usr/bin/perl use strict; use warnings; use YAML::Syck qw(LoadFile); use Data::Dumper; my $yaml = LoadFile( 'test-re.yaml' ); print Dumper($yaml->{patterns}), "\n";

test-re.yaml:

--- patterns: - !!perl/regexp (?^i:^foo.*bar.*baz) - !!perl/regexp ^quux$

Output:

$VAR1 = [ qr/(?^:(?^i:^foo.*bar.*baz))/, qr/(?^:^quux$)/ ];

Output when changing use YAML::Syck to use YAML:

$VAR1 = [ qr/(?^ui:^foo.*bar.*baz)/, qr/(?^u:^quux$)/ ];

So yeah, seems to be a YAML::Syck particularity. Whether it is a bug is a matter of opinion I guess, since the regexes do behave the same so nothing should break.


Comment on Re: Strange YAML behavior with lists of qr regexp values
Select or Download Code
Re^2: Strange YAML behavior with lists of qr regexp values
by naChoZ (Curate) on Jan 30, 2013 at 15:06 UTC

    I notice that YAML::XS is similarly affected. Storing regular expressions themselves obviously must not be on too many radars. ;)

    --
    Andy

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1015745]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others wandering the Monastery: (11)
As of 2015-07-06 22:30 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









    Results (84 votes), past polls