using System;

using System.Text.RegularExpressions;

​

public class Program

{

    public static void Main()

    {

        var str1 = "Clear/1.1.9 x86_64 iOS/14.4";

            var str2 = "Clear/1.1.9 Android SDK built for x86 Android/10";

            var str3 = "Clear/10.1.9 Android SDK built for x86 Android/10";

            var str4 = "Clear/1.10.9 Android SDK built for x86 Android/10";

            var str5 = "Clear/1.1.90 Android SDK built for x86 Android/10";

            var str6 = "Clear/11.11.91 Android SDK built for x86 Android/10";

            var str7 = "Clear/99999999.9999999.9999999 Android SDK built for x86 Android/10";

​

            var regex = new Regex(@"Clear/(\d+.\d+.\d+)", RegexOptions.Compiled);

            var match1 = regex.Match(str1);

            var match2 = regex.Match(str2);

            var match3 = regex.Match(str3);

            var match4 = regex.Match(str4);

            var match5 = regex.Match(str5);

            var match6 = regex.Match(str6);

            var match7 = regex.Match(str7);

​

            Console.WriteLine("#1");

            Console.WriteLine(match1.Success);

            Console.WriteLine(match1.Groups[1].Value);

            Console.WriteLine(Environment.NewLine);

            Console.WriteLine("#2");

            Console.WriteLine(match2.Success);

            Console.WriteLine(match2.Groups[1].Value);

            Console.WriteLine(Environment.NewLine);

            Console.WriteLine("#3");

            Console.WriteLine(match3.Success);

            Console.WriteLine(match3.Groups[1].Value);

            Console.WriteLine(Environment.NewLine);

            Console.WriteLine("#4");

            Console.WriteLine(match4.Success);

            Console.WriteLine(match4.Groups[1].Value);

            Console.WriteLine(Environment.NewLine);

            Console.WriteLine("#5");

            Console.WriteLine(match5.Success);

            Console.WriteLine(match5.Groups[1].Value);

            Console.WriteLine("#6");

            Console.WriteLine(match6.Success);

            Console.WriteLine(match6.Groups[1].Value);

            Console.WriteLine("#7");

            Console.WriteLine(match7.Success);

            Console.WriteLine(match7.Groups[1].Value);

    }

}