user interface - GUI Email validator in Java -

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i'm working on gui validation... please see problem below...

how validate email specific format? @ least 1 digit before @ , 1 digit after , @ least 2 letters after dot.

string emailformat = "m@m.co"; pattern patternemail = pattern.compile("\\d{1,}@\\d{1,}.\\d{2,}");             matcher matchername = patternemail.matcher(studentemail);

this regex pattern emails

string pt = "^[_a-za-z0-9-\\+]+(\\.[_a-za-z0-9-]+)*@[a-za-z0-9-]+(\\.[a-za-z0-9]+)*(\\.[a-za-z]{2,})$";

you can try this

    list email = arrays.aslist("xyzl@gmail.com", "@", "sxd");     predicate<string> validmail = (n) -> n.matches(pt);     email.stream().filter(validmail).foreach((n) -> system.out.println(n));

this description can change according need.

    ^           #start of line   [_a-za-z0-9-\\+]+ #  must start string in bracket [ ], must contains 1 or more (+)   (         #   start of group #1     \\.[_a-za-z0-9-]+   #     follow dot "." , string in bracket [ ], must contains 1 or more (+)   )*            #   end of group #1, group optional (*)     @           #     must contains "@" symbol      [a-za-z0-9-]+      #       follow string in bracket [ ], must contains 1 or more (+)       (         #         start of group #2 - first level tld checking        \\.[a-za-z0-9]+  #           follow dot "." , string in bracket [ ], must contains 1 or more (+)       )*        #         end of group #2, group optional (*)       (         #         start of group #3 - second level tld checking        \\.[a-za-z]{2,}  #           follow dot "." , string in bracket [ ], minimum length of 2       )         #         end of group #3 $           #end of line

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