Why are the first two alternatives not capturing quoted test strings?
Because your position is still at the string start so you can't use a lookbehind (or if you do it will never match). Simpler just to use this:
use strict;
use warnings;
use Test::More tests => 3;
my @strings = (
'Now is the time',
'"Now is the time"',
"'Now is the time'",
);
my $regex = qr/^['"]?(.*?)['"]?$/;
for my $input (@strings) {
my ($match) = ($input =~ /$regex/);
is $match, 'Now is the time', "$input matched";
}
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