title: Python Regular expression: Find adjacent characters
body: <p>I need to get a list that contains every two adjacent characters in the string <code>hello</code> such that  </p>
  
  <pre><code>['he', 'el', 'll', 'lo']
  </code></pre>
  
  <p>I thought I could do it int this way  </p>
  
  <pre><code>&gt;&gt;&gt;import re
  &gt;&gt;&gt;re.findall(r'..', 'hello')
  ['he', 'll']
  </code></pre>
  
  <p>Which is not what I want. I need to get a list as I mentioned above using Regular Expression</p>