title: Python regular expression to find letters and numbers
body: <p>Entering a string</p>
  
  <p>I used <code>'findall'</code> to find words that are only letters and numbers (The number of words to be found is not specified).</p>
  
  <p>I created: </p>
  
  <p><code>words = re.findall ("\ w * \ s", x) # x is the input string</code>
  If i entered <code>"asdf1234 cdef11dfe a = 1 b = 2"</code>
  these sentences seperated <code>asdf1234, cdef11dfe, a =, 1, b =, 2</code>
  I would like to pick out only <code>asdf1234</code>, <code>cdef11dfe</code></p>
  
  <p>How do you write a regular expression?</p>