title: Python Image.open() does not recognize regular expression
body: <pre><code>from PIL import Image
  image1 = "Image_I0000_F1_Filter 1_1A_health_2014-05-20_11.05.33.483.tiff"
  image2 = "*F1*.tiff"
  im1 = Image.open(image1)
  im2 = Image.open(image2)
  </code></pre>
  
  <p>Tried to open the same image. im1 opens with no problem, but im2 shows IOError: [Errno 2] No such file or directory: '*F1*.tiff'. </p>
  
  <p>Also tried </p>
  
  <pre><code>image2 = r"*F1*.tiff"
  im2 = Image.open(image2)
  </code></pre>
  
  <p>and </p>
  
  <pre><code>image2 = "*F1*.tiff"
  im2 = Image.open(open(image2,'rb'))
  </code></pre>
  
  <p>neither works.</p>