title: Keep only numeric value from a string?
body: <p>I have some strings like this</p>
  
  <pre><code>string phoneNumber = "(914) 395-1430";
  </code></pre>
  
  <p>I would like to strip out the parethenses and the dash, in other word just keep the numeric values.</p>
  
  <p>So the output could look like this </p>
  
  <pre><code>9143951430
  </code></pre>
  
  <p>How do I get the desired output ?</p>