chat notifier: fix matching messages with included punctuation

The punctuation is not in \b or \s, so additionally include \z. Also
added \A for the beginning, which would have the same problem, which the
test also tests for.

Co-authored-by: Adam <Adam@sigterm.info>

runelite-client/src/main/java/net/runelite/client/plugins/chatnotifications/ChatNotificationsPlugin.java

@@ -120,8 +120,8 @@ public class ChatNotificationsPlugin extends Plugin
 				.map(this::quoteAndIgnoreColor) // regex escape and ignore nested colors in the target message
 				.collect(Collectors.joining("|"));
 			// To match <word> \b doesn't work due to <> not being in \w,
-			// so match \b or \s
-			highlightMatcher = Pattern.compile("(?:\\b|(?<=\\s))(" + joined + ")(?:\\b|(?=\\s))", Pattern.CASE_INSENSITIVE);
+			// so match \b or \s, as well as \A and \z for beginning and end of input respectively
+			highlightMatcher = Pattern.compile("(?:\\b|(?<=\\s)|\\A)(?:" + joined + ")(?:\\b|(?=\\s)|\\z)", Pattern.CASE_INSENSITIVE);
 		}
 	}