use Text::CSV_XS;
use feature 'say';
use warnings;

my @tests = (
             [q[1|str|foo\\|bar|goo|2323] => [qw(1 str foo|bar goo 2323)]],
             [q[foo\\\\|bar] => [qw(foo\\ bar)]],
            );

for my $t (@tests)
{
    my $s = $t->[0];
    my @e = @{$t->[1]};

    my $csv = Text::CSV_XS->new(
                                {
                                    sep_char => '|',
                                    escape_char => '\\',
                                }
                               ) or die "" . Text::CSV_XS->error_diag();
    $csv->parse($s);
    my @o = $csv->fields();

    say "$s\n  @e\n  @o\n";
}