Fix handling query with multiple subselect JOIN clauses

src/Regex.php

@@ -126,6 +126,14 @@ public function sqlParameter(string $subject, &$matches = null)
      */
     public function tableAlias(string $subject, &$matches = null)
     {
+        if (
+            preg_match(
+                '/^\s*(\(.*\))\s+(?:AS\s+)?([' . self::SQLCHARS . ']+)\s+ON\s/uis',
+                $subject,
+                $matches
+            )
+        )
+            return 1;
         return preg_match(
             '/`?([' . self::SQLCHARS . ']+[.:]?[' . self::SQLCHARS . '*]*)`?(\s+AS)?(\s+`?([' . self::SQLCHARS . ']*)`?)?/ui',
             $subject,

tests/Queries/SelectTest.php

@@ -285,4 +285,20 @@ public function testFetchColumn()
         self::assertEquals(false, $statement);
         self::assertEquals(false, $statement2);
     }
-}
+
+    public function testMulitpleSubselectJoinClauses(): void
+    {
+        $query = $this->fluent->from('user')
+            -> disableSmartJoin()
+            -> leftJoin(
+                "(SELECT user_id, count(*) AS count FROM comment GROUP BY user_id) comments ON user.id = comments.user_id"
+            )
+            -> leftJoin(
+                "(SELECT user_id, count(*) AS count FROM article GROUP BY user_id) articles ON user.id = articles.user_id"
+            )
+            ->select("comments.count AS total_comments")
+            ->select("articles.count AS total_articles");
+        self::assertEquals('SELECT user.*, comments.count AS total_comments, articles.count AS total_articles FROM user LEFT JOIN (SELECT user_id, count(*) AS count FROM comment GROUP BY user_id) comments ON user.id = comments.user_id  LEFT JOIN (SELECT user_id, count(*) AS count FROM article GROUP BY user_id) articles ON user.id = articles.user_id',
+        $query->getQuery(false));
+    }
+}