Fixing over greedy footnote regex

js/markdown.js

  * the document.
  */
 class MDFootnoteReader extends MDReader {
-	static #footnoteWithTitleRegex = /^\[\^([^\]]+?)\s+"(.*?)"\]/;  // 1=symbol, 2=title
-	static #footnoteRegex = /^\[\^([^\]]+?)\]/;  // 1=symbol
+	static #footnoteWithTitleRegex = /^\[\^([^\s\[\]]+?)\s+"(.*?)"\]/;  // 1=symbol, 2=title
+	static #footnoteRegex = /^\[\^([^\s\[\]]+?)\]/;  // 1=symbol
 
 	/**
 	 * @param {MDState} state

markdownjs.html

 [testimage]: https://picsum.photos/102/75
 [google]: https://google.com  "I prefer Duck Duck Go"
 
-Some verbatim <span style="color:green;">HTML</span>. A script tag will be ignored. <script></script>
-			</textarea>
+Some verbatim &lt;span style="color:green;"&gt;HTML&lt;/span&gt;. A script tag will be ignored. &lt;script&gt;&lt;/script&gt;</textarea>
 		</div>
 		<div class="previewhalf half">
 			<div id="preview">
 			</div>
 		</div>
 	</body>
-</html>
+</html>