Performance Benchmarks for Testing [a-Z]

ReadMe.md

Must be using .NET 7.0 which introduces both:

• Char.IsAsciiLetter
• GeneratedRegexAttribute

Program.cs

using System;
using System.Linq;
using System.Text.RegularExpressions;
using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Jobs;
using BenchmarkDotNet.Running;


BenchmarkRunner.Run<TestAlphaCheck>();


public class TestAlphaCheck
{
    [Params("hello world", "Привет, мир")]
    public string Title { get; set; } = "";

    [Benchmark]
    public bool HasAlpha_IsAsciiLetterLinq() => Title.Any(Char.IsAsciiLetter);

    [Benchmark]
    public bool HasAlpha_IsAsciiLetterForEach()
    {
        foreach (var c in Title)
        {
            if (Char.IsAsciiLetter(c))
            {
                return true;
            }
        }
        return false;
    }

    [Benchmark]
    public bool HasAlpha_IsAsciiLetterForLoop()
    {
        for (int i = 0; i < Title.Length; i++)
        {
            if (char.IsAsciiLetter(Title[i]))
            {
                return true;
            }
        }
        return false;
    }


    [Benchmark]
    public bool HasAlpha_RegexInline() => Regex.IsMatch(Title, "[a-zA-Z]");

    [Benchmark]
    public bool HasAlpha_RegexCompiled() => AlphaRegex.IsMatch(Title);
    public static readonly Regex AlphaRegex = new Regex("[a-zA-Z]", RegexOptions.Compiled);

    [Benchmark]
    public bool HasAlpha_RegexGenerated() => RegexExtensions.HasLetter().IsMatch(Title);
}


public static partial class RegexExtensions
{

    [GeneratedRegex("[a-zA-Z]")]
    public static partial Regex HasLetter();
}