title: Validating phone number using regex with support for multuple numbers
body: <p>I am not very experienced with regex and I need to validate phone numbers using javascript. 
  I have a textbox which need to be allowed to accept multiple phone numbers with a delimiter of <code>';'</code> and the characters that can be allowed for the phone numbers are </p>
  
  <ol>
  <li>Numbers</li>
  <li>'+'</li>
  <li>'-'</li>
  </ol>
  
  <p>Could someone help me on how I can acheive this using javascript and regex/ regular expressions?</p>
  
  <p>Example: </p>
  
  <blockquote>
    <p>+91-9743574891;+1-570-456-2233;+66-12324576</p>
  </blockquote>
  
  <p>I tried the following: </p>
  
  <pre><code>^[0-9-+;]+$
  </code></pre>
  
  <p>Am not sure if this is correct.</p>