MFM: Improve title syntax

src/mfm/parse/elements/title.ts

@@ -9,7 +9,7 @@ export type TextElementTitle = {
 };
 
 export default function(text: string) {
-	const match = text.match(/^【(.+?)】\n/);
+	const match = text.match(/^(【|\[)(.+?)(】|])\n/);
 	if (!match) return null;
 	const title = match[0];
 	return {

test/mfm.ts

@@ -115,6 +115,18 @@ describe('Text', () => {
 				{ type: 'search', content: 'a b c SEARCH', query: 'a b c'}
 			], tokens4);
 		});
+
+		it('title', () => {
+			const tokens1 = analyze('【yee】\nhaw');
+			assert.deepEqual(
+				{ type: 'title', content: '【yee】\n', title: 'yee'}
+			, tokens1[0]);
+
+			const tokens2 = analyze('[yee]\nhaw');
+			assert.deepEqual(
+				{ type: 'title', content: '[yee]\n', title: 'yee'}
+			, tokens2[0]);
+		});
 	});
 
 	describe('syntax highlighting', () => {