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CultureStringSlicator.md

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Reading country code from culture string

What's the fastest way to read country code from culture string? Does input string casing matter?

BenchmarkDotNet=v0.13.1, OS=Windows 10.0.19045
Intel Core i7-7820HQ CPU 2.90GHz (Kaby Lake), 1 CPU, 8 logical and 4 physical cores
.NET SDK=7.0.100
  [Host]     : .NET 6.0.11 (6.0.1122.52304), X64 RyuJIT
  DefaultJob : .NET 6.0.11 (6.0.1122.52304), X64 RyuJIT
Method Culture Mean Error StdDev Gen 0 Allocated
Substring to-TO 33.97 ns 0.540 ns 0.505 ns 0.0191 80 B
Substring TO-TO 34.65 ns 0.678 ns 0.634 ns 0.0191 80 B
Substring to-to 43.14 ns 0.906 ns 0.890 ns 0.0268 112 B
SpanSplit to-TO 57.37 ns 0.536 ns 0.475 ns 0.0114 48 B
SpanSplit to-to 58.18 ns 1.217 ns 1.139 ns 0.0114 48 B
SpanSplit TO-TO 60.07 ns 1.108 ns 0.865 ns 0.0114 48 B
NaiveSplit TO-TO 95.86 ns 1.433 ns 1.270 ns 0.0362 152 B
NaiveSplit to-TO 96.09 ns 1.567 ns 1.466 ns 0.0362 152 B
NaiveSplit to-to 109.32 ns 1.266 ns 1.184 ns 0.0440 184 B
Regex to-TO 230.62 ns 2.096 ns 1.858 ns 0.1109 464 B
Regex TO-TO 232.30 ns 4.703 ns 5.227 ns 0.1109 464 B
Regex to-to 247.19 ns 3.866 ns 3.616 ns 0.1183 496 B