title: Mobile or phone number validation in javascript
body: <p>I need to validate phone or mobile number in javascript.<br/>
  It should match the following types:<br/>
  <code>+91-9198387083</code><br/>
  <code>9198387083</code><br/>
  <code>09198387083</code><br/>
  It is a 10 digit number with one of these four prefixes <code>'+91-'</code>, <code>'+91'</code>, <code>'0'</code> or <code>''</code>
  <br/>
  Can someone suggest me a regex expression in javascript which matches all the three types.</p>