Need help converting a snippet of code from PHP to Javascript - php

Question

below is a snippet of code that I started with... then I made some changes based on the commented suggestion from stackoverflow user. (Please see below for my progress so far)
ORIGINAL
$valid = true;
// basic validation
$phoneNumber = str_replace( ' ', '', $phoneNumber );
if ( strlen( $phoneNumber ) < 10 || !is_numeric( $phoneNumber ) ) {
$valid = false;
}
$areaCode = substr($phoneNumber, 0, 3);
$prefix = substr($phoneNumber, 3, 3);
$mainPhone = substr($phoneNumber, 3, 7);
// perform the same regex matching:
if ($valid) {
$regex = '/^(?:\([2-9]\d{2}\)\ ?|[2-9]\d{2}(?:\-?|\ ?))/';
$valid = preg_match($regex, $areaCode);
}
if ($valid) {
$regex = '/^(?!\d[1]{2}|[5]{3})([2-9]\d{2})([. -]*)\d{4}$/';
$valid = preg_match($regex, $mainPhone);
}
// perform the original web validation:
if ( $valid ) {
// validate area code
if (
$areaCode == '000' ||
$areaCode == '111' ||
$areaCode == '222' ||
$areaCode == '333' ||
$areaCode == '444' ||
$areaCode == '555' ||
$areaCode == '666' ||
$areaCode == '777' ||
$areaCode == '999' ||
$areaCode == '123' || (is_string($areaCode) && !is_numeric($areaCode))) {
$valid = false;
}
}
if ( $valid ) {
// validate prefix
if ( $prefix == '123' ||
$prefix == '000' ||
$prefix == '111' ||
$prefix == '555' || (is_string($prefix) && !is_numeric($prefix))) {
$valid = false;
}
}
if ( $valid ) {
// validate main phone number
if ( $mainPhone == '2222222' ||
$mainPhone == '3333333' ||
$mainPhone == '4444444' ||
$mainPhone == '6666666' ||
$mainPhone == '7777777' ||
$mainPhone == '8888888' ||
$mainPhone == '9999999' || (is_string($phoneNumber) && !is_numeric($phoneNumber))) {
$valid = false;
}
}
return $valid;
NEW JAVASCRIPT VERSION (SO FAR)
below is a snippet of code that I am converting so far... I still have some PHP stuff in there can you guys help me out to remove/replace what this snippet needs to say to make it work?
function is_numeric(n) {
return !isNaN(parseFloat(n)) && isFinite(n);
}
function phonenumberIsValid(phonenumber)
{
var valid = true;
// basic validation
var phonetest = phonenumber.replace(' ','');
if ( strlen( phonetest ) < 10 || !is_numeric( phonetest ) ) {
valid = false;
}
var areaCode = phonetest.substr(0,3);
var prefix = phonetest.substr(3,3);
var mainPhone = phonetest.substr(3,7);
// perform the same regex matching that LeadMaster does:
if(valid){
valid = areaCode.match('/^(?:\([2-9]\d{2}\)\ ?|[2-9]\d{2}(?:\-?|\ ?))/');
}
if(valid){
valid = mainPhone.match('/^(?!\d[1]{2}|[5]{3})([2-9]\d{2})([. -]*)\d{4}$/');
}
// perform the original web validation:
if(valid){
// validate area code
if (
areaCode == '000' ||
areaCode == '111' ||
areaCode == '222' ||
areaCode == '333' ||
areaCode == '444' ||
areaCode == '555' ||
areaCode == '666' ||
areaCode == '777' ||
areaCode == '999' ||
areaCode == '123' || (!is_numeric(areaCode)) {
valid = false;
}
}
if(valid) {
// validate prefix
if ( prefix == '123' ||
prefix == '000' ||
prefix == '111' ||
prefix == '555' || (!is_numeric(prefix)) {
valid = false;
}
}
if(valid) {
// validate main phone number
if ( mainPhone == '2222222' ||
mainPhone == '3333333' ||
mainPhone == '4444444' ||
mainPhone == '6666666' ||
mainPhone == '7777777' ||
mainPhone == '8888888' ||
mainPhone == '9999999' || (!is_numeric(phoneNumber)) {
valid = false;
}
}
return valid;
}

Answer 1

PregMatch can be replaced with "myString".match so for instance.
if ($valid) {
$regex = '/^(?:\([2-9]\d{2}\)\ ?|[2-9]\d{2}(?:\-?|\ ?))/';
$valid = preg_match($regex, $areaCode);
}
would become
if(valid){
valid = areaCode.match('/^(?:\([2-9]\d{2}\)\ ?|[2-9]\d{2}(?:\-?|\ ?))/');
}
and
str_replace("search","replace",$myString)
becomes
myString.replace("search","replace")
In fact most of this can be worked out yourself by typing things like "str_replace javascript" into google and looking for the previous stack overflow answer :)