c# – Regular expression to filter for errors and exceptions

I’m trying to filter for errors and exceptions in a text given. I want to show only the rows, which include “Exception/Error/Warning.”
I have the following piece of code, but it returns only 2 chars from the text.

 string pattern = @"(?<error>d+)";
        Match m = Regex.Match(this.gettext(), pattern, RegexOptions.IgnoreCase);
        if (m.Success)
        {
            Console.WriteLine(m.Value);
        }