title: Regular expression for Indian mobile numbers
body: <p>I want to find all the phone number's in a file, I need RegEx for this</p>
  
  <p>valid formats:</p>
  
  <pre><code>+91 9916075509
  +91-9916075509
  +919916075509
  9916075509
  </code></pre>
  
  <p>Also it should be able to take care of the space's before and after the phone number's most of the RegEx i found in google were not able to take care of the space. </p>
  
  <p>I would appreciate if someone of you can help me out!</p>