Match mentions when the username is wrapped in quotes

Signed-off-by: Joas Schilling <coding@schilljs.com>

lib/private/Comments/Comment.php

@@ -225,14 +225,14 @@ class Comment implements IComment {
 	 *
 	 */
 	public function getMentions() {
-		$ok = preg_match_all("/\B(?<![^a-z0-9_\-@\.\'\s])@[a-z0-9_\-@\.\']+/i", $this->getMessage(), $mentions);
+		$ok = preg_match_all("/\B(?<![^a-z0-9_\-@\.\'\s])@(\"[a-z0-9_\-@\.\' ]+\"|[a-z0-9_\-@\.\']+)/i", $this->getMessage(), $mentions);
 		if(!$ok || !isset($mentions[0]) || !is_array($mentions[0])) {
 			return [];
 		}
 		$uids = array_unique($mentions[0]);
 		$result = [];
 		foreach ($uids as $uid) {
-			$result[] = ['type' => 'user', 'id' => substr($uid, 1)];
+			$result[] = ['type' => 'user', 'id' => trim(substr($uid, 1), '"')];
 		}
 		return $result;
 	}

tests/lib/Comments/CommentTest.php

@@ -150,8 +150,11 @@ class CommentTest extends TestCase {
 				['foobar', 'barfoo', 'foo@bar.com', 'bar@foo.org@foobar.io', '23452-4333-54353-2342', 'yolo']
 			],
 			[
-			'@@chef is also a valid mention, no matter how strange it looks', ['@chef']
-			]
+				'@@chef is also a valid mention, no matter how strange it looks', ['@chef']
+			],
+			[
+				'Also @"user with spaces" are now supported', ['user with spaces']
+			],
 		];
 	}