I think it's stupid, and I don't see the issue seeing as how there are tons of good, available C++ libraries.
Wow, C++ doesn't have regular expressions built in? Only in libraries? This is just horrible, I don't want BYOND to use a C++ library for it. They better wait until it is implemented into the language itself, otherwise it is simply stupid.
The exact same thing can be said about fseek. It is no feature that will require hundreds and hundreds of lines of code, so... what is the problem? If it will make the program better, go for it!