r.dev/flutter/dart-core/List-class.html">List&lt;String&gt;</a> if the string does not contain <code>hashtag</code>.</p>
<p>returns empty <a href="https://api.flutter.dev/flutter/dart-core/List-class.html">List&lt;String&gt;</a> if the string is empty.</p>
<p>customRegExp is your own custom RegExp.</p>
<pre class="language-dart"><code class="language-dart">"hi there, i love #flutter.".getHashtags() // returns ["flutter"]
"i love #Flutter.".getHashtags() // returns ["Flutter"]
"i love Flutter.".getHashtags()