title: How to negate the sequences of characters in the positive lookbehind using regexes?
body: <p>Given the following strings:<br></p>
  <pre><code>&lt;i&gt;aaa&gt;
  &lt;i&gt;aaa&gt;&gt;
  &lt;i&gt;AAA&gt;
  &lt;i&gt;AAA&gt;&gt;
  &lt;i&gt;999&gt;
  &lt;i&gt;9&gt;
  &lt;i&gt;&gt;
  &lt;b&gt;aaa&gt;
  &lt;b&gt;AAA&gt;
  </code></pre>
  <p>I want to use regular expressions to match one or more final angle brackets <code>&gt;</code> if the string contains <code>&lt;i&gt;</code> followed by some sequence of characters.</p>
  <p>I have tried using the positive lookbehind: <code>(?&lt;=&lt;i&gt;[A-Za-z\d].*)&gt;.*</code> in order to ignore the <code>&lt;i&gt;</code> and some sequence of characters until the final bracket, but got the error <code>* A quantifier inside a lookbehind makes it non-fixed width</code>.</p>
  <p>How to group the characters inside the positive lookbehind?</p>