darisler,
I am not sure why you are looking for a recursive regex here. Instead, I would simply match globally (perhaps as an iterator) and count how many matches I had: 
my @result = $prBoundaryString =~ m{$coord}g;
# check if scalar (@result / 2) % 2 == 1

# or

my $count = 0;
while ($prBoundaryString =~ m{$coord}g) {
    my ($x, $y) = ($1, $2);
    $count++;
}

[download]
Sorry I had to rush this so it is untested and it may not be explained enough but I hope it makes sense.

Cheers - L~R

In reply to Re: qr for recursive regex? by Limbic~Region
in thread qr for recursive regex? by darisler

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