SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 2)
    Literal \'https://www.clickhouse.com/\' (alias s)
    Function REGEXP_REPLACE (children 1)
     ExpressionList (children 3)
      Identifier s
      Literal \'^https?://(?:www\\\\.)?([^/]+)/.*$\'
      Literal \'\\\\1\'