title: Python: Get/Scan All Text After a Certain String
body: <p>I have a text file which I read using readlines(). I need to start extracting data after a keyword in the text file. For example, after the key word <code>Hello World</code> below, I would like to retrieve the value 100 from <code>Blah=100</code>:</p>
  <pre><code>Blah=0 
  Blah=2
  Hello World
  All the Text
   Will be Scan
  And Relevant       
    Info will be
   Retrieved Blah=100
  </code></pre>
  <p>I can easily retrieved the information I want from the text file but I need it to start retrieving ONLY after a certain keyword in the textfile, such as after the <code>'Hello World'</code> above. What I am currently doing is to retrieve the value using <code>.split('=')</code>. Thus, I will retrieve all 3 values which are <code>Blah=0</code>, <code>Blah=2</code> and <code>Blah=100</code>. I only wish to retrieve the value after a keyword in the text file, say <code>'Hello World'</code>, which is the value <code>Blah=100</code>.</p>
  <p>There must be a simple way to do this. Please help. Thanks.</p>