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Re: JSON saving regex?

by GrandFather (Cardinal)
on Jan 27, 2012 at 02:32 UTC ( #950251=note: print w/ replies, xml ) Need Help??


in reply to JSON saving regex?

In essence you can't do that. $test contains a Perl regular expression object and JSON doesn't have an out-of-the-box way to deal with them.

If you don't need to round trip the data, but are providing it for consumption elsewhere the allow_blessed function will suppresses the error, insert a 'null', and carry on:

use strict; use warnings; use JSON qw(); my $test = {regex => qr/^[\w\@\.]+$/, str => "this is a string"}; my $json = JSON->new(); $json->allow_blessed(1); print $json->encode($test);

Prints:

{"str":"this is a string","regex":null}

Update: and if you do want to round trip it with another Perl script then think about using YAML instead:

use strict; use warnings; use YAML qw(); my $test = {regex => qr/\w+\W+(\w+)/, str => "this is a string"}; my $yamlStr = YAML::Dump($test); print "YAML: $yamlStr\n"; my $andBack = YAML::Load ($yamlStr); my ($secondWord) = $andBack->{str} =~ $andBack->{regex}; print "Second word is: $secondWord\n";

Prints:

YAML: --- regex: !!perl/regexp (?-xism:\w+\W+(\w+)) str: this is a string Second word is: is
True laziness is hard work


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