title: pathnames in Common Lisp, filenames with wildcards in them
body: <p>The characters <code>*</code> and <code>?</code> are used as wildcards in pathnames. How does one refer to a filename that has <code>?</code> as one of its actual characters? For example:
  <code>
  [18]&gt; (wild-pathname-p #p"foo")
  NIL
  [19]&gt; (wild-pathname-p #p"foo?")
  T
  </code>
  So referring to the filename "foo?" cannot be done this way. I tried to escape the <code>?</code> with a backslash, but that didn't work. I tried going unicode by using <code>\u3f</code> or <code>\u003f</code>, but that didn't work. </p>
  
  <p>How do I refer to a file that contains a wildcard as part of its name: How to probe it, open it, etc.?</p>