Regex Tips

JPAValidation

// email validation, supports only lower case emails
@Pattern(regexp="[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\\."
        +"[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@"
        +"(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?",
             message="Invalid Email")
protected String email;

// not blank
@NotNull(message="Title can not be NULL.")
@Pattern(regexp="^(?!\\s*$).+", message="Title can not be empty.")
private String title;