Regex IsMatch stops matching

I’m writing a checker with Regex, and I’m testing results with one of the popular tools:
https://regex101.com/r/DeMWEy/1

I have a list of strings that should match:

Process(Bystronic.Ads.GraphQL)\% Processor Time
Process(Bystronic.ParameterTuning.WebApi.Service)\\% Processor Time
Process(Bystronic.Ads.GraphQL)\\IO Write Bytes/sec
Process(DcCutting)\\IO Read Bytes/sec
Process(DcCutting)\\% Processor Time

And a regex that should match all of them.

"Process(.+)\\.+"

Here is a MVC:

using System.Text.RegularExpressions;

public class MainClass
{

    private static bool IsProcessMatch(string column)
    {
        return Regex.IsMatch(column, "Process(.+)\\.+");
    }

    public static void Main()
    {
        var result1 = IsProcessMatch("Process(Bystronic.Ads.GraphQL)\\% Processor Time");
        var result2 = IsProcessMatch("Process(Bystronic.ParameterTuning.WebApi.Service)\\% Processor Time");
        var result3 = IsProcessMatch("Process(Bystronic.Ads.GraphQL)\\IO Write Bytes/sec");
        var result4 = IsProcessMatch("Process(DcCutting)\\IO Read Bytes/sec");
        var result5 = IsProcessMatch("Process(DcCutting)\\% Processor Time");

        Console.WriteLine(result1);
        Console.WriteLine(result2);
        Console.WriteLine(result3);
        Console.WriteLine(result4);
        Console.WriteLine(result5);
    }
}

I’m getting a match in the first and second one, but not in the rest. Can somebody explain me the difference between them?

>Solution :

C# treats the pattern a little different than the regex engine used page that you posted. On the left side there is a menue where you can choose the flavor. If you choose C# you will see:

that one little detail is missing: @ in your code. The page will add it for you

private bool IsProcessColumn(string column)
{
    return Regex.IsMatch(column, @"Process(.+)\\.+");
}

Here is a fiddle for testing