C# Benchmark with RegexOptions.ECMAScript

[khaale]

It might be worth using RegexOptions.ECMAScript in C# benchmark, or just add another bench for c# with this option. It drops some 'advanced' features like Unicode support, which increases performance in ~1.5-2 times.

I understand that it's a questionable decision, and I could mention some pros and cons here:

• We are competing with different regex engines, and some of them, like JS one, as far as I'm aware, does not support UTF. So it's a bit unfair to compare motorbike with a truck.
• It looks like we compare default regex usage patterns, and I have never seen anyone use RegexOptions.ECMAScript in a real life.

My results (Windows 10, dotnet core 2.1.4):

Original

1824.7035 - 92
1560.8753 - 5301
109.0058 - 5

With ECMAScript

1072.2842 - 92
908.0764 - 5301
110.9607 - 5

[mariomka]

Finally, I have configured as ECMAScript for C# implementation.