I'll second the anonymous monk's suggestion to use Text::CSV (or, better, Text::CSV_XS):
use Text::CSV_XS;
use feature 'say';
use warnings;
my @tests = (
[q[1|str|foo\\|bar|goo|2323] => [qw(1 str foo|bar goo 232
+3)]],
[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";
}
The regex/split suggestions fail to take into consideration a doubled escape prior to a delimiter (see the second test). For your example, that may be fine, but your example is so obviously contrived that it can't be taken definitively.
Output:
$ perl5.16.2 x.pl
1|str|foo\|bar|goo|2323
1 str foo|bar goo 2323
1 str foo|bar goo 2323
foo\\|bar
foo\ bar
foo\ bar
Hope that helps.