Is there a fast way to parse through a large file with regex?

Question

Problem: Very very, large file I need to parse line by line to get 3 values from each line. Everything works but it takes a long time to parse through the whole file. Is it poss

Answer 1

Instead of recreating a regex for each call to GetRateLine, create it in advance, passing the RegexOptions.Compiled option to the Regex(String,RegexOptions) constructor.

You may also want to try reading in the entire file to memory, but I doubt that's your bottleneck. It shouldn't take a minute to read in ~100MB from disk.