This function uses a regular expression to validate an email address and ensure it is in the correct format using strict rules to verify the length of the domain suffix, position of the @ symbol and valid characters etc. If the email address is valid it returns true, otherwise it returns false.

function isEmailAddress(s) {
	var objRegExp = /^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z] {2,4})$/
	return objRegExp.test(s);

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