Escaping trivia dataset before passing it into regex.

src/games/trivia.js

@@ -226,6 +226,15 @@ function onCommand(args, context) {
 	}
 }
 
+// answers are plain text and may contain regex characters, like '*batteries not included'
+function getAnswerRegexp(answer) {
+	const pattern = answer
+		.replace(/[.*+?^${}()|[\]\\]/g, '\\$&')
+		.replace(/\\[.?*]|!/g, '$&?'); // punctuation is optional, so T.S. Eliot also matches TS Eliot, and *NSYNC matches NSYNC
+
+	return new RegExp(pattern, 'i');
+}
+
 async function onMessage(message, context) {
 	const game = games.get(context.room?.id);
 
@@ -235,7 +244,7 @@ async function onMessage(message, context) {
 
 	const { answer, fullAnswer } = game.questions[game.round];
 
-	if (new RegExp(answer, 'i').test(decode(message.originalBody || message.body)) && !game.answers.has(context.user.id)) { // resolve HTML entities in case original body is not available, such as & to &
+	if (getAnswerRegexp(answer).test(decode(message.originalBody || message.body)) && !game.answers.has(context.user.id)) { // resolve HTML entities in case original body is not available, such as & to &
 		game.answers.set(context.user.id, {
 			user: context.user,
 			answer: message.body,