Email validation

a!localVariables(
  local!emails,
  local!invalidEmails: if(
    isnull(local!emails),
    {},
    joinarray(
      reject(
        isnull(_),
        a!forEach(
          items: split(local!emails, " "),
          expression: if(
            validateemailaddress(fv!item),
            null,
            fv!index
          )
        )
      ),
      ","
    )
  ),
  local!validation: if(
    isnull(local!invalidEmails),
    {},
    "Invalid email at " & local!invalidEmails & " position(s)"
  ),
  a!textField(
    label: "Enter emails",
    value: local!emails,
    saveInto: local!emails,
    validations: local!validation
  )
)

I want my email addresses validation each mail should be in one line otherwise throw an error and email format should be correct other wise throw an error.
( test@test.com
 test2@test.com
 test3@test.com

) 

can someone help me with the code and how to store this email address in line by line in db