Regular expression matching E.164 formatted phone numbers

Question

I need to add a regular expression that matches all possible valid E.164 formatted phone numbers.

This regex works fine for for North American phone numbers, but I

Answer 1

Well, I used the accepted answer but it failed for many cases:

For inputs like:

• Where numbers did not start with "+".
• Where number count was less than 9.

the regex failed.

I finally used

^\+(?:[0-9]?){6,14}[0-9]$

This worked like charm!