Regular expression for validating international phone numbers
The format can vary – 1, 43, 962 1868 are all valid codes.There isn’t necessarily a one-to-one mapping; 44 for example, is used not just for the United Kingdom but for the Isle of Man, Guernsey and Jersey.Below is some of its advanced features: There is an important note that the input must be revalidated when the user choose another country from the drop list.Unfortunately, intl-tel-input doesn't provide an event or callback that is executed after choosing a country.When a carrier runs out of one set of numbers – like, sadly, premium-rate – they simply introduce a new prefix.
First though, let’s look at the issue of collecting telephone numbers. However, because of the issues around the variations in format, it doesn’t actually place any restrictions on what the user can type, nor does it perform any validation in the same way as, say, the email element.
The continued strain on the pool of available numbers can only increase the likelihood of further changes.
It’s often important to capture a number’s international dialing code.
But for anything remotely automated – such as sending SMS messages – or to validate them effectively, you’ll need to capture the country prefix.
The countries library contains a bunch of geographical information which includes international dialing codes.