title: regexp: match everything exept a single word
body: <p>I don't get how to create a regular expression that matches everything, except a fixed, single word. Can somebody help me?</p>
  
  <p>Background: alias map for mailserver which redirects all mail to one user. <code>/.*/ -&gt; user1</code> produces a redirection loop, so i need to exclude <code>user1</code> from the regexp.</p>
  
  <p>Edit:</p>
  
  <p>The regex should match <em>everything</em>, EXCEPT the single word <em>user1</em>. It should also match input that contains that word, i.e., <em>user11</em>.</p>
  
  <p>i.e.: /.*/ without <em>user1</em></p>
  
  <p>Edit2:</p>
  
  <p>POSIX Basic Regular Expressions</p>