Using regex to validate a phone number in Javascript

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Validating phone numbers is an important part of any web form. There are many ways to do this, but one of the most effective is to use a regular expression, or "regex." Regex can be used to validate a wide variety of data, including phone numbers. Here, we'll show you how to use regex to validate a phone number in Javascript. We'll also provide a few tips on how to make sure your phone number regex is as effective as possible.

function is_number_valid(val) {
    const re = /^[\+]?[(]?[0-9]{3}[)]?[-\s\.]?[0-9]{3}[-\s\.]?[0-9]{4,6}$/;
    return re.test(val);
}

console.log("01234567890: " + is_number_valid("01234567890")); // true
console.log("123-456-7890: " + is_number_valid("123-456-7890")); // true
console.log("123.456.7890: " + is_number_valid("123.456.7890")); // true
console.log("123 456 7890: " + is_number_valid("123 456 7890")); // true
console.log("(123) 456 7890: " + is_number_valid("(123) 456 7890")); // true
console.log("1: " + is_number_valid("1")); // false

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