title: Drupal - How to create internal and external links with module
body: <p>In drupal 4.x, in contents, links are created like this<br>
  [url=1]Some text[/url]<br>
  So when "Some text" click it open node 1.</p>
  
  <p>Sometime it may link to external url also. like below:<br>
  [url=http://www.abc.com/somepage.html] external link [/url]</p>
  
  <p>same thing how can i do it in drupal 7.x</p>