You could also change your push line to:

   push @newlines, s/\Q$A\E/$B/rg for @lines;

[download]
(the \E is optional in this case, as the quoted variable is the last thing in the RE) to handle the quotemeta within the search/replace itself. See perlre for more information.

Update: Add clarification for my 'optional' comment.

--MidLifeXis

In reply to Re: seek and replace for exceptional characters by MidLifeXis
in thread seek and replace for exceptional characters by semipro

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