.付きのusernameを認識できるように

src/client/app/common/views/directives/autocomplete.ts

@@ -107,7 +107,7 @@ class Autocomplete {
 
 		if (isMention) {
 			const username = text.substr(mentionIndex + 1);
-			if (username.match(/^[\w-]+$/)) {
+			if (username.match(/^[\w.-]+$/)) {
 				this.open('user', username.toLowerCase());
 				opened = true;
 			}

src/mfm/language.ts

@@ -262,8 +262,7 @@ export const mfmLanguage = P.createLanguage({
 	mention: () => {
 		return P((input, i) => {
 			const text = input.substr(i);
-			// eslint-disable-next-line no-useless-escape
-			const match = text.match(/^@\w([\w-]*\w)?(?:@[\w\.\-]+\w)?/);
+			const match = text.match(/^@([\w.-]+)(?:@[\w.-]+\w)?/);
 			if (!match) return P.makeFailure(i, 'not a mention');
 			// @ の前に何かあればハッシュタグ扱いしない
 			if (input[i - 1]?.match(/[^\s\u200b]/)) return P.makeFailure(i, 'not a mention');

test/mfm.ts

@@ -427,6 +427,19 @@ describe('parse', () => {
 				]);
 			});
 
+			it('remote with dot', () => {
+				const tokens = parseFull('@hima.sub@namori.net foo');
+				assert.deepStrictEqual(tokens, [
+					leaf('mention', {
+						acct: '@hima.sub@namori.net',
+						canonical: '@hima.sub@namori.net',
+						username: 'hima.sub',
+						host: 'namori.net'
+					}),
+					text(' foo')
+				]);
+			});
+
 			it('ignore', () => {
 				const tokens = parseFull('idolm@ster');
 				assert.deepStrictEqual(tokens, [