title: Regular expression usage in glob.glob?
body: <pre><code>import glob
  
  list = glob.glob(r'*abc*.txt') + glob.glob(r'*123*.txt') + glob.glob(r'*a1b*.txt')
  
  for i in list:
    print i
  </code></pre>
  <p>This code works to list files in the current folder which have <code>'abc'</code>, <code>'123'</code> or <code>'a1b'</code> in their names.</p>
  <p>How would I use one <code>glob</code> to perform this function?</p>