// regex bench

​

using System;

using System.Diagnostics;

using System.Text.RegularExpressions;

​

public class Program

{

    public static long TicksBudget = 1000000; // 1ms

​

    public static string[] TestPatterns = new[]

    {

        string.Empty,

        @"allo",

        @"121212",

        @"*&%%#&^*($",

        @"  ads21d(",

        @"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",

        @"(\w+)*(\w*)+",

        @"^(\s?)?((\d+([\s\-\.]?\d+)?)|\d+)([\s\-\.]?((\d+([\s\-\.]?\d+)?)|\d+))*(\s?(x|ext|ex|p|poste)\.?\s?\d+)?$",

        @"^\d+(?:[-.\s]\d+)*(?:\s?(?:ext?|x|poste|p)\.?\s?\d+)?$",

        @"^(?:\+?\(?\d+\)?(?:[-.\s]\(?\d+\)?)*(?:\s?(?:Ext?|EXT?|ext?|X|x|POSTE|poste|P|p)\.?\s?\d+)?)$",

    };

​

    public static string[] TestInputs = new[]

    {

        string.Empty,

        "allo",

        "121212",

        "*&%%#&^*($",

        "  ads21d(",

        "55555555555555555-",

        "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa-aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",

        @"\b(?<word>\w+)\s+(\k<word>)\b",

        "55555555555555555555555555555555555555555555555$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$",

    };

​

    public static long BenchRegex(string pattern)

    {

        try

        {

            var regex = new Regex(

                pattern,

                RegexOptions.IgnoreCase, // RegexOptions.Compiled | RegexOptions.IgnoreCase,

                TimeSpan.FromTicks(TicksBudget));

​

            var watch = new Stopwatch();

            watch.Start();

            foreach (var input in TestInputs)

            {

                regex.IsMatch(input);

            }

​

            watch.Stop();

            return watch.ElapsedTicks;

        }

        catch (ArgumentException)

        {

            Console.WriteLine("PARSE ERROR");

            // Console.WriteLine(ex);

            return -1;

        }

        catch (RegexMatchTimeoutException)

        {

            Console.WriteLine("TIMEOUT");

            // Console.WriteLine(ex);

            return TicksBudget;

        }

        catch (Exception ex)

        {

            Console.WriteLine(ex);

            return -1;

        }

    }

    public static void Main()

    {

        foreach (var pattern in TestPatterns)

        {

            Console.WriteLine($"Testing {pattern}");

            var ticks = BenchRegex(pattern);

            var budget = ticks >= 0 ? (double)ticks/TicksBudget*100 : 0;

​

            Console.WriteLine($"... {ticks} ns ({budget}% budget spent)");

            Console.WriteLine();

        }

    }

}