Rather than matching the separation character, match the directory names: 
use strict;
use warnings;

use File::Spec::Functions qw(:ALL);

use feature 'say';

my $testpath = catdir('foo','bar');
#say $testpath;
my ($sepchar) = $testpath =~ m/^foo(.+)bar$/
    or die 'Separation character identification failed';
say $sepchar;

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#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.

In reply to Re^4: Perl appending \ or / based on windows or linux by kennethk
in thread Perl appending \ or / based on windows or linux by sravs448

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