title: why complement searchlist doesn't work?
body: <p>I expect <code>"abc" =~ /\Aabc\z/gc;</code> to be false, as <code>/c</code> is there,like in this case:</p>
  
  <pre><code>$pathname =˜ tr/a-zA-Z/_/cs; # change non-(ASCII)alphas to single underbar
  </code></pre>
  
  <p>But it turns out to be <code>true</code>, anyone can explain the reason?</p>