Thank you for catching that, it was meant more like 
@sub{@_} = ("(",")");
my $LRS=join'|',map quotemeta,@_;
{local $^W=0;s/($LRS.|.)/$sub{$1}/gs; eval{m/$_/}

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In reply to Re: Re (tilly) 2 (fails): Determining if you have balanced delimiters by I0
in thread Determining if you have balanced delimiters by Ovid

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