title: Regex to get NUMBER only from String
body: <p>I recieve "7+" or "5+" or "+5" from XML and wants to extract only the number from string using Regex.
  e.g Regex.Match() function</p>
  
  <pre><code>        stringThatHaveCharacters = stringThatHaveCharacters.Trim();
          Match m = Regex.Match(stringThatHaveCharacters, "WHAT I USE HERE");
          int number = Convert.ToInt32(m.Value);
          return number;
  </code></pre>