PCRE is a set of extensions to RE to enable parsing of nonregular grammars. This is just RE. It's like calling some hypothetical language C++--. It doesn't make sense.
Well, if I designed a language that was C++ but stripped of some specific features for a purpose that made it less than C++, but still not quite just C, I might call it C++-- as a joke. In that respect, I think it makes perfect sense.