title: Python string (argument) -> Regex
body: <p>I'm trying to take a regular expression as an argument to my python program (which is a string naturally) and simply match it against another string.</p>
  
  <p>Let's say I run it as</p>
  
  <p><code>python program.py 'Hi.there'</code></p>
  
  <p>I'd like to be able to then take that input (call it input) and say whether or not it matches 'HiTthere' (it should).</p>
  
  <p>How should I do this? I'm inexperienced at regex.</p>