Phone validation regex

Question

I\'m using this pattern to check the validation of a phone number

^[0-9\\-\\+]{9,15}$

It\'s works for 0771234567 and +0

Answer 1

This solution actually validates the numbers and the format. For example: 123-456-7890 is a valid format but is NOT a valid US number and this answer bears that out where others here do not.

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If you do not want the extension capability remove the following including the parenthesis: (?:\s*(?:#|x.?|ext.?|extension)\s*(\d+)\s*)? :)

edit (addendum) I needed this in a client side only application so I converted it. Here it is for the javascript folks:

var myPhoneRegex = /(?:(?:\+?1\s*(?:[.-]\s*)?)?(?:(\s*([2-9]1[02-9]|[2-9][02-8]1|[2-9][02-8][02-9]‌​)\s*)|([2-9]1[02-9]|[2-9][02-8]1|[2-9][02-8][02-9]))\s*(?:[.-]\s*)?)([2-9]1[02-9]‌​|[2-9][02-9]1|[2-9][02-9]{2})\s*(?:[.-]\s*)?([0-9]{4})\s*(?:\s*(?:#|x\.?|ext\.?|extension)\s*(\d+)\s*)?$/i;
if (myPhoneRegex.test(phoneVar)) {
    // Successful match
} else {
    // Match attempt failed
}

hth. end edit

This allows extensions or not and works with .NET

(?:(?:\+?1\s*(?:[.-]\s*)?)?(?:(\s*([2-9]1[02-9]|[2-9][02-8]1|[2-9][02-8][02-9]‌​)\s*)|([2-9]1[02-9]|[2-9][02-8]1|[2-9][02-8][02-9]))\s*(?:[.-]\s*)?)([2-9]1[02-9]‌​|[2-9][02-9]1|[2-9][02-9]{2})\s*(?:[.-]\s*)?([0-9]{4})(?:\s*(?:#|x\.?|ext\.?|extension)\s*(\d+))?$

To validate with or without trailing spaces. Perhaps when using .NET validators and trimming server side use this slightly different regex:

(?:(?:\+?1\s*(?:[.-]\s*)?)?(?:(\s*([2-9]1[02-9]|[2-9][02-8]1|[2-9][02-8][02-9]‌​)\s*)|([2-9]1[02-9]|[2-9][02-8]1|[2-9][02-8][02-9]))\s*(?:[.-]\s*)?)([2-9]1[02-9]‌​|[2-9][02-9]1|[2-9][02-9]{2})\s*(?:[.-]\s*)?([0-9]{4})\s*(?:\s*(?:#|x\.?|ext\.?|extension)\s*(\d+)\s*)?$

All valid:

1 800 5551212

800 555 1212

8005551212

18005551212

+1800 555 1212 extension65432

800 5551212 ext3333

Invalid #s

234-911-5678

314-159-2653

123-234-5678

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EDIT: Based on Felipe's comment I have updated this for international.

Based on what I could find out from here and here regarding valid global numbers

This is tested as a first line of defense of course. An overarching element of the international number is that it is no longer than 15 characters. I did not write a replace for all the non digits and sum the result. It should be done for completeness. Also, you may notice that I have not combined the North America regex with this one. The reason is that this international regex will match North American numbers, however, it will also accept known invalid # such as +1 234-911-5678. For more accurate results you should separate them as well.

Pauses and other dialing instruments are not mentioned and therefore invalid per E.164

\(?\+[0-9]{1,3}\)? ?-?[0-9]{1,3} ?-?[0-9]{3,5} ?-?[0-9]{4}( ?-?[0-9]{3})?

With 1-10 letter word for extension and 1-6 digit extension:

\(?\+[0-9]{1,3}\)? ?-?[0-9]{1,3} ?-?[0-9]{3,5} ?-?[0-9]{4}( ?-?[0-9]{3})? ?(\w{1,10}\s?\d{1,6})?

Valid International: Country name for ref its not a match.

+55 11 99999-5555 Brazil

+593 7 282-3889 Ecuador

(+44) 0848 9123 456 UK

+1 284 852 5500 BVI

+1 345 9490088 Grand Cayman

+32 2 702-9200 Belgium

+65 6511 9266 Asia Pacific

+86 21 2230 1000 Shanghai

+9124 4723300 India

+821012345678 South Korea

And for your extension pleasure

+55 11 99999-5555 ramal 123 Brazil

+55 11 99999-5555 foo786544 Brazil

Enjoy