javascript - Can someone explain what this Email regex means -

^(([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\s@\"]+)*)|(\".+\"))     @((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-za-z\-0-9]+\.)   +[a-za-z]{2,}))$ 

i understand parts of regex not entire expression , like

([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\s@\"]+)*)

match 1 or more characters that's not characters

<>()[\]\\.,;:\s@\"  \\  not sure [\]\\  , \s@\ means 

i understand of other parts not single entity.

here go:

^(     (         [^<>()[\]\\.,;:\s@\"]+ // disallow these characters amount of times         (             \. // allow dots             [^<>()[\]\\.,;:\s@\"]+ // disallow these characters amount of times         )* // group must occur once or more     )     | // or     (\".+\") // surrounded quotes (is legal?) ) @ // @ symbol litterally (     // ip address     (         \[ // allows square bracket         [0-9]{1,3} // 1 3 digits (for ip address         \. // allows dot         [0-9]{1,3} // 1 3 digits (for ip address         \. // allows dot         [0-9]{1,3} // 1 3 digits (for ip address         \. // allows dot         [0-9]{1,3} // 1 3 digits (for ip address         \] // square bracket     )      | // or domain name     (         ([a-za-z\-0-9]+\.) // valid domain characters a-za-z0-9 plus dashes         +         [a-za-z]{2,} // top level (anything after dot) must @ least 2 chars long , a-za-z     ) )$