Regular expressions - rianjs/DotNetPerfTesting GitHub Wiki

• https://github.com/rianjs/DotNetPerfTesting/blob/master/PerfTesting/PerfTesting/Strings/RegexTests.cs

.NET 7 on Intel 64

BenchmarkDotNet=v0.13.5, OS=macOS Ventura 13.2.1 (22D68) [Darwin 22.3.0]
Intel Core i7-8850H CPU 2.60GHz (Coffee Lake), 1 CPU, 12 logical and 6 physical cores
.NET SDK=7.0.102
  [Host]     : .NET 7.0.2 (7.0.222.60605), X64 RyuJIT AVX2
  DefaultJob : .NET 7.0.2 (7.0.222.60605), X64 RyuJIT AVX2```


|                        Method |        Mean |     Error |    StdDev |
|------------------------------ |------------:|----------:|----------:|
|                   GetCompiled | 4,376.75 ns | 12.299 ns | 10.270 ns |
|                 GetUncompiled |   512.33 ns |  4.364 ns |  3.644 ns |
|            StaticRegexIsMatch |   169.83 ns |  1.672 ns |  1.482 ns |
| CachedPrecompiledRegexIsMatch |    84.77 ns |  0.382 ns |  0.339 ns |
|  CachedUncompiledRegexIsMatch |   147.61 ns |  2.543 ns |  2.379 ns |
|           InlineInstantiation | 1,476.28 ns | 19.194 ns | 17.015 ns |

Regex sizes

• https://github.com/rianjs/DotNetPerfTesting/blob/master/PerfTesting/Scratch/Program.cs

Single run

Uncompiled results

• Biggest: 388,856
• Smallest: 378,656
• Mean: 2,048

Compiled results

• Biggest: 580,040
• Smallest: 376,296
• Mean: 15,892

Dictionary of regexes across multiple runs

Uncompiled results

• Biggest: 604,336
• Smallest: 393,904
• Mean: 31,986

Compiled results

• Biggest: 664,000
• Smallest: 426,064
• Mean: 145,552

Uncompiled results

• Biggest: 608,800
• Smallest: 393,904
• Mean: 32,987

Compiled results

• Biggest: 664,000
• Smallest: 426,064
• Mean: 161,803

Uncompiled results

• Biggest: 605,760
• Smallest: 393,904
• Mean: 32,715

Compiled results

• Biggest: 664,000
• Smallest: 426,064
• Mean: 168,299

.NET 8 on M3 Mac

BenchmarkDotNet v0.13.12, macOS Sonoma 14.4 (23E214) [Darwin 23.4.0]
Apple M3, 1 CPU, 8 logical and 8 physical cores
.NET SDK 8.0.100
  [Host]   : .NET 8.0.0 (8.0.23.53103), Arm64 RyuJIT AdvSIMD
  ShortRun : .NET 8.0.0 (8.0.23.53103), Arm64 RyuJIT AdvSIMD

Job=ShortRun  IterationCount=3  LaunchCount=1  
WarmupCount=3  

Method	Mean	Error	StdDev	Gen0	Gen1	Allocated
GetCompiled	1,643.12 ns	78.556 ns	4.306 ns	0.6905	0.0076	5776 B
GetUncompiled	221.93 ns	3.631 ns	0.199 ns	0.1414	0.0002	1184 B
StaticRegexIsMatch	69.29 ns	4.393 ns	0.241 ns	-	-	-
CachedPrecompiledRegexIsMatch	39.57 ns	0.129 ns	0.007 ns	-	-	-
CachedUncompiledRegexIsMatch	64.14 ns	3.371 ns	0.185 ns	-	-	-
InlineInstantiation	605.07 ns	36.594 ns	2.006 ns	0.4702	0.0019	3936 B