title: Find all strings except one string using regex
body: <p>I want to match all strings except the string <code>"ABC"</code>.
  Example: </p>
  
  <pre><code> "A"     --&gt; Match
   "F"     --&gt; Match
   "AABC"  --&gt; Match
   "ABCC"  --&gt; Match
   "CBA"   --&gt; Match
   "ABC"   --&gt; No match
  </code></pre>
  
  <p>I tried with <code>[^ABC]</code>, but it ignores <code>"CBA"</code> (and others).</p>