hi on my web form there is a login page on which when the user Register the whether its email id and password is in which format (upper ,lower) and save it database
and when user try to login it should check it is in same format as it was while registration
eg
my email id is name@company.com
and password is pass@123
but when i am entering the email NAME@COMPANY.COM
and password as PASS@123 its should not accept it