regular expression java
//Ther are three type of REGULAR EXPRESSION
//first
^(.+)@(.+)$ "^(.+)@(.+)$""
//second
^[A-Z0-9._%+-]+@[A-Z0-9.-]+.[A-Z]{2,6}$
//third
^[\w!#$%&'*+/=?`{|}~^-]+(?:\.[\w!#$%&'*+/=?`{|}~^-]+)*@(?!-)(?:[a-zA-Z0-9-]+\.)+[a-zA-Z]{2,6}$Copyright © 2021 Codeinu
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