title: Deleting all the lines before a WORD on sublime text
body: <p>I have a Big Text File that contains +1M Lines</p>
  
  <p>and there's a word <code>johnd</code> on line 45280525. I want to delete all the lines before it.</p>
  
  <p>How I can do that using Sublime Text?</p>
  
  <p>Note that Notepad++ won't work with this file.</p>