title: Regular expression to match Phone Number pattern of USA in java
body: <p>Can somebody give me the regex for phone number. </p>
  
  <p><strong>The format is :</strong></p>
  
  <p>A phone number used for calls must contain only the characters  <code>+</code> , <code>–</code> , <code>*</code> and <code>0-9</code>.</p>
  
  <p>Only the leading character may be a  <code>+</code>  <strong>Or</strong>  <code>*</code> </p>