Hello kdjantzen,

As tobyink says, you’re better off not setting a default value — especially as you overwrite it immediately in sub BUILD anyway. However, in the unlikely event that you really do have a use case for this, follow the advice of the error message generated when setting default => \qr//:

References are not allowed as default values, you must wrap the defaul
+t of 're' in a CODE reference (ex: sub { [] } and not []) at ...

[download]

For example, this works:

#! perl
use strict;
use warnings;

package Test
{
    use Moose;

    has re => (is => 'rw', isa => 'RegexpRef', default => sub { qr/abc
+/; });

    sub BUILD
    {
        my $self = shift;

        $self->re(qr/^[0-9]+$/);
    }

    sub match
    {
        my ($self, $string) = @_;

        return $string =~ $self->re ? 'matches' : 'does not match';
    }
}

my $t = Test->new();

print "$_ ", $t->match($_), "\n" for 'abc123def', '456';

[download]

Hope that helps,

Athanasius <°(((>< contra mundum Iustus alius egestas vitae, eros Piratica,

In reply to Re: Moose RegexpRef by Athanasius
in thread Moose RegexpRef by kdjantzen

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.