ode>'\u{0308}'</code>. If placed within a character class, such as <code>[c̈]</code>, the regex will consider the character class being the
enumeration <code>[c\u{0308}]</code> instead. It will, therefore, match every <code>'c'</code> and every <em>umlaut</em> that isn’t expressed as a
single codepoint, which is extremely unlikely to be the intended behavior.</p>
<p>This rule raises an issue every time Unicode Grapheme Clusters are used within a character class of a regular expression.</p>
<h3>Noncomplia