Your problem is confusing single quotes and double quotes.
'\,' is exactly equal to '\\,' and so is "\\,"
$text = '1,This is a problem->\\,B,2';
has only one backslash before the comma and therefor should *not* split there.
my $regex = qr/(?<!\\),|(?<=\\\\),/;
is correct and should not split at the '\\,' (which is exactly equal to '\,')
I'd recommend you play around with single quotes and backslashes to understand how they work.
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