A simpler example to report is: 

% perl -MO=Deparse -e "s{\[A\]}[s/\[B\]/C/g]g"
s[\[A\]][s/[B]/C/g]g;
-e syntax OK

[download]
But I don't consider it a bug. If your delimiters are [] then \[ becomes [. If you want \[ then you'll need \\\[ (or \\[ also works if the square brackets balance).

So, inside qq[], [] and \[\] are the same. Much like "\g" and "g" are the same or '\g' and '\\g' are the same.

                - tye

In reply to Re^3: matching / splitting within a substitution (simpler) by tye
in thread matching / splitting within a substitution by PodMaster

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