in reply to Re^2: how to measure strictness of a regex ?
in thread how to measure strictness of a regex ?

I think my original code when I was testing was something along the lines of:

print re_strictness qr/.../, "\n";

In which case the ($) prototype helps Perl see the "\n" as a parameter for print, not for re_strictness.

By the way, it's worth pointing out that qr/^Dad+y$/ is also considered slightly stricter than qr/Dad+y/.

use 5.014; use strict; use warnings; use re (); use List::Util 'sum'; sub re_strictness ($) { sum map length, re::regmust shift } print re_strictness qr/^Dad+y$/, "\n", re_strictness qr/Dad+y/, "\n", re_strictness qr/D.+/, "\n", ;
package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name