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Regular Expression - international telephone format

I have an ASP.net form in which I need to validate an input field for either a North American or international telephone number.

For the North American format I have:
ValidationExpression="\d{3}-\d{3}-\d{4}"

How can this be altered so that it accepts either the NA or the international telephone formats?

ozo

what formats do you want to accept for international phone numbers?
the international prefix for north america is +1

rafayali

Umm, I am not an expert on an internal telephone formats, but how can there be any? The reason I say this is because each country has a different scheming. For example, I am originally from a country that uses a two digit city code, along with 7 digit phone numbers. But, there are cities in my native place that have 6 digit numbers.

Clearly, this does not follow the pattern we have in North America (where I am right now).

I believe each country has its own schemes and you cannot generalize an international telephone format, UNLESS THERE IS SUCH A STANDARD ???? I did a search on google for this but it did not reveal that there is such a format, so if there is let me know.

You would have to study each country's telephone format and create a regular expression for that.

cgcmq

ASKER

I found this:
((\+\d{1,3}(-| )?$?\d$?(-| )?\d{1,5})|($?\d{2,6}$?))(-| )?(\d{3,4})(-| )?(\d{4})(( x| ext )\d{1,5}){0,1}$

at http://javascript.about.com/library/blre.htm which seems pretty flexible.

ASKER CERTIFIED SOLUTION

ozo

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