I understand that in a single quoted string '//' is the same as '/' and looking at the printed string

my $text = '1,This\, is a problem->\\,B,99';
print "$text\n";
> output
1,This\, is a problem->\,B,99
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I can see this.

Whilst, as you point out, I can get a regex to work correctly, I still can't get the output that I need. '//' is the same as '/' so I am never going to be able to 'differentiate' the two, or have I still not grasped it!