string extension method - Chomp

chomp.cs

using System.Text.RegularExpressions;

namespace Extensions
{
    public static class StringExtensions
    {
        /// <summary>
        /// Small function to try and strip a bunch of text down to the first 
        /// number of words, or just return the original string if it is less 
        /// than that number of words.
        /// </summary>
        /// <param name="str">string to search (the object being called on)</param>
        /// <param name="wordcount">How many words to include</param>
        /// <param name="afterstring">The string to append to the chopped down string (i.e. "...")</param>
        /// <returns>The chomp'ed string, with the afterstring appended.</returns>
        public static string ChompString(this string str, int wordcount, string afterstring)
        {
            // Start of string (\A) any spaces (\s*), any character except space (\S) one or more times,
            // then any space zero or more times, matched for wordcount.
            Regex regex = new Regex(@"\A(\s*(\S+)\s+){" + wordcount + "}", RegexOptions.Compiled);

            Match match = regex.Match(str);

            return match.Success ? match.Value + afterstring : str;
        }
    }
}