title: Remove everything before space using regular expression in python
body: <p>Suppose I have a string: 997 668, now I need to remove anything before space i.e I need 668 as the output. I need a solution using regular expression. Now I am using the below:</p>
  
  <pre><code>x = '997 668'
  x  = x.split(' ')[1]
  </code></pre>
  
  <p>Above also give the output but fails when there is only one number, if x = 555 then output comes blank which I dont want.</p>