What and how to quickly parse .obj in c++ (libraries, methods)?

Question

C++ / C#

What and how to quickly parse .obj in c++? I saw a lot of examples, but everything depends on speed, for example, my parser loads a model of 24,000 polygons in about 3 minutes (0_0). I use regular expressions.

Answer 1

Don't use regular expressions.
Parse not from a file, but by loading the entire file into memory.
obj has a linear, deterministic format, you can even write a switch (large, long, ugly, but fast).