Optimize regexes

[Ernest314]

Current implementations are often very naive and unoptimized.

See: https://blog.stevenlevithan.com/archives/greedy-lazy-performance

[Ernest314]

This includes not using the RegexOptions.Compiled option.

Takes an order of magnitude more time to start up, and then is about 30% faster. This should only ever be used when they're only instantiated once (i.e. static Regex objects), and the regex is also fairly complex. See: https://blog.codinghorror.com/to-compile-or-not-to-compile/

[Ernest314]

reading resources (taken from #143):

• https://docs.microsoft.com/en-us/dotnet/standard/base-types/best-practices
• https://docs.microsoft.com/en-us/archive/blogs/bclteam/optimizing-regular-expression-performance-part-i-working-with-the-regex-class-and-regex-objects-ron-petrusha
• https://docs.microsoft.com/en-us/archive/blogs/bclteam/optimizing-regular-expression-performance-part-ii-taking-charge-of-backtracking-ron-petrusha

[Ernest314]

Also see #389