easy regexp by ySas

@0=@b='';s![[(](.+?)[])]|([^?])!@b=map{$c=$_;map$c.~$_,@{$'&p},map{split'\x83'x/\x83/}~$+}@b!egfor<>.$/;print@b

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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