Regular expressions javascript

I am validating a web page via a javascript function using regular expressions. Here is my variable:

var RE_phone = /^[\d\+]{3,4}([\- ]?)\d{1,3}([\- ]?)\d{3}([\- ]?)\d{4}$/;

I am needing it to validate both national and international numbers. So far it is working correctly, except for national numbers.

Here is an example of a national number that I would like to be able to accept as a valid number: 04 4784897 or 044784897.

Can I please have some help to modify my regular expression variable to accept national phone numbers in the above format?

thanks

From here

Code:

---

Title        Test Details Pattern Title
Expression       
^(\+[1-9][0-9]*(\([0-9]*\)|-[0-9]*-))?[0]?[1-9][0-9\- ]*$
Description       
International phone number check - optional country code followed by area code surrounded with '-' or '(' and ')', or just an area code optionally starting with 0, followed by phone numder. The number itself may contain spaces and '-'
Matches       
+123(45)678-910 | +123-045-67 89 10 | 01-234-56-78
Non-Matches       
123(45)678 91011 | (12)345-678 | +0(12)345-6789

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