case_id,category,description,input FE01,basic,Plain ASCII,alice@example.com FE02,basic,Mixed case,Alice@Example.COM FE03,basic,All caps,ALICE@EXAMPLE.COM FE04,basic,Whitespace padding, alice@example.com FE05,displayname,Display name no quotes,Alice Smith <alice@example.com> FE06,displayname,Display name with quotes,"""Alice Smith"" <alice@example.com>" FE07,displayname,Wrapped in angle brackets only,<alice@example.com> FE08,prefix,mailto: prefix,mailto:alice@example.com FE09,prefix,MAILTO: caps,MAILTO:Alice@Example.com FE10,gmail,Gmail with dots,a.l.i.c.e@gmail.com FE11,gmail,Gmail with +tag,alice+newsletter@gmail.com FE12,gmail,Gmail with both,a.l.i.c.e+work@gmail.com FE13,gmail,Non-Gmail with dots (don't touch),a.l.i.c.e@example.com FE14,gmail,Non-Gmail with +tag (don't touch),alice+newsletter@example.com FE15,idn,Unicode in domain,alice@münchen.de FE16,idn,Unicode in local,アリス@example.jp FE17,trailing,Trailing comma,"alice@example.com," FE18,trailing,Trailing period,alice@example.com. FE19,trailing,Trailing closing paren,alice@example.com) FE20,trailing,Trailing semicolon,alice@example.com; FE21,smartquote,Wrapped in curly quotes,“alice@example.com” FE22,invalid,Missing @,aliceexample.com FE23,invalid,Double @,alice@@example.com FE24,invalid,Multiple @,alice@example@com FE25,invalid,Spaces inside,alice @ example.com FE26,invalid,TLD-less local network,alice@localhost FE27,multiple,Two comma-separated,"alice@example.com, bob@example.com" FE28,multiple,Two semicolon-separated,alice@example.com; bob@example.com FE29,edge,Empty, FE30,edge,Whitespace-only, FE31,edge,Already perfect,alice@example.com