You could do this with a global match but it probably fails your "just gets ugly" criterion.
use strict;
use warnings;
my $str = q{"one","two", "not three" , ' four',"five " };
my @arr = $str =~ m
{(?x)
(?<=['"])
([^,'"]+)
(?=['"])
}g;
print qq{-->$_<--\n} for @arr;
Here's the output.
-->one<--
-->two<--
-->not three<--
--> four<--
-->five <--
This method is going to fall down pretty quickly as your data gets more complex and I agree with others who have suggested some sort of CSV module to tackle the problem.
Cheers,
JohnGG
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