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

The accepted answer doesn't work with numbers without '+' sign. And I did a little math following the Wikipedia metrics, Country Code : 1 to 3 digits,
maximum : 15, Actual Phone Number : 12 (upon 15-3) to 14 (15-1) digits

The minimum in this regard is 10. For instance, the dummy US number "+14155552671" is the bare minimum. Breaking it down, +1 is US Country Code and the rest is all 'Area Code' + 'Subscriber Number' which is going to be 10. I couldn't find, in my research, a number less than 7 digits (Sweden) and is valid.

So the regex I had to come up with that works along with '+' sign along with the digits which much reside between 10~15 is as follows:

^\++?[1-9][0-9]\d{6,14}$

And this works well. You can check it out on Regex101.

Answer 2

I think until you have a great set of examples, you are best served by a flexible regex. This one will match a + followed by 10-14 digits.

^\+?\d{10,14}$

Broken down, this expression means: ^ Match begining of string. \+? Optionally match a + symbol. \d{10,14} Match between 10 and 14 digits. $ Ensure we are at the end of the string.

If you learn that a digit at a particular index must not be 1 or 0, then you can use the [2-9] at that position, like this:

^\+?\d{6,7}[2-9]\d{3}$

[2-9] means match any digit from 2 through 9 (don't match 0 or 1.)

Answer 3

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!

Answer 4

This RegEx ^\\+?[0-9]{1,3}[ 1-9]\\d{1,14}$ also works without Invalid regular expression.

Answer 5

This matches only formats like +16174552211 and 16174552211

/\A\+?\d{11}\z/

It is especially useful if you are using Twilio and Ruby on Rails

Answer 6

The accepted answer is good, except an E.164 number can have up to 15 digits. The specification also doesn't indicate a minimum, so I wouldn't necessarily count on 10.

It should be ^\+?[1-9]\d{1,14}$.

See http://en.wikipedia.org/wiki/E.164