Validação de número de telefone nepali js regex

function validateNepaliPhoneNoFormat(phoneNumber) {
	let regexPhoneNo = /^[\+]?[+]?[0-9]{3}[-]?[0-9]{10}$/;
	console.log(regexPhoneNo, phoneno);
	if (phoneno.match(regexPhoneNo)) {
		return true;
	} else {
		return false;
	}
}
var phoneNumber = +977-9876543210; 
// or 
var phoneNumber = +9779876543210;
console.log(validateNepaliPhoneNoFormat(phoneNumber))
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