I've written a couple parsers in D using https://github.com/PhilippeSigaud/Pegged https://github.com/PhilippeSigaud/Pegged and they seem pretty fast and easy to

I've written a couple parsers in D using https://github.com/PhilippeSigaud/Pegged https://github.com/PhilippeSigaud/Pegged and they seem pretty fast and easy to verify. Of course since it generates a lot of code at compile time, you can end up with somewhat slow builds.