The Experimental Andrew U

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var regexObj = /^\(?([0-9]{3})\)?[-. ]?([0-9]{3})[-. ]?([0-9]{4})$/;

if (regexObj.test(subjectString)) {
    var formattedPhoneNumber =
        subjectString.replace(regexObj, "($1) $2-$3");
} else {
    // Invalid phone number
}