title: Extracting alphanumeric substring from a string in python
body: <p>i have a string in python</p>
  
  <pre><code>text = '(b)'
  </code></pre>
  
  <p>i want to extract the 'b'. I could strip the first and the last letter of the string but the reason i wont do that is because the text string may contain '(a)', (iii), 'i)', '(1' or '(2)'. Some times they contain no parenthesis at all. but they will always contain an alphanumeric values. But i equally want to retrieve the alphanumeric values there. </p>
  
  <p>this feat will have to be accomplished in a one line code or block of code that returns justthe value as it will be used in an iteratively on a multiple situations</p>
  
  <p>what is the best way to do that in python,</p>