title: need to split the string based on the keyword
body: <pre><code>string = """Hello World A \n Block1 \n Block2 \n \n Hello World B \n Block1 \n Block2"""
  </code></pre>
  
  <p>I want to split the string into two parts using regular expression in python, in which the first part should Contain the block Hello World A till Hello World B and the second part should contain the block from Hello World B till the end of the string.</p>
  
  <p>I tried <code>re.findall(</code>) , but that didn't fetch me expected results. I want to know which regular expression statement can be used in this?</p>