Your problem is confusing single quotes and double quotes.

'\,' is exactly equal to '\\,' and so is "\\," 

$text = '1,This is a problem->\\,B,2';

[download]

has only one backslash before the comma and therefor should *not* split there. 
my $regex = qr/(?<!\\),|(?<=\\\\),/;

[download]
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.

In reply to Re: Regex with Backslashes by tybalt89
in thread Regex with Backslashes by anita2R

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