The benchmarks are pretty impressive, if accurate. I don't see too much stuff written in Delphi these days, either.
Impressive indeed. I personally know the author and he also programmed a complete implementation of the ECMAScript (5th edition) in Object Pascal. BRRE is also a part of this.
I'm the author of BESEN and BRRE. No, BESEN's regex engine is in truth the predecessor of BRRE, so BRRE is the greatly feature-enhanced successor regex engine of (and based on) the regex engine from BESEN. :)