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.Since E.164 doesn't define minimum, personally, I would allow for a two digit-long international number just to be future proof. In several countries, mobile phone numbers are indistinguishable from landline phone numbers without at least a number plan lookup, and in some cases, even that won't help.For example, in Sweden, lots of people have "ported" their regular, landline-like phone number to their mobile phone. List phone Numbers = new Array List(); phone Numbers.add(" 1 1234567890123"); phone Numbers.add(" 12 123456789"); phone Numbers.add(" 123 123456"); String regex = "^\ (? )[0-9]$"; Pattern pattern = Pattern.compile(regex); for(String email : phone Numbers) Output: 1 1234567890123 : true 12 123456789 : true 123 123456 : true This regular expression follows the international phone number notation specified by the Extensible Provisioning Protocol (EPP).Having opened this cookbook, you are probably eager to inject some of the ungainly strings of parentheses and question marks you find in its chapters right into your code.If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware.
On the contrary, the 555 prefix is reserved for fake-out phone numbers. :\(\s*([2-9]1[02-9]|[2-9][02-8]1|[2-9][02-8][02-9])\s*\)|([2-9]1[02-9]|[2-9][02-8]1|[2-9][02-8][02-9]))\s*(? -Adam My gut feeling is reinforced by the amount of replies to this topic - that there is a virtually infinite number of solutions to this problem, none of which are going to be elegant.In this regex tutorial, we will learn to validate international phone numbers based on industry-standard notation specified by ITU-T E.123The rules and conventions used to print international phone numbers vary significantly around the world, so it’s hard to provide meaningful validation for an international phone number unless you adopt a strict format. It is used by a growing number of domain name registries, including .com, .info, .net, .org, and Fortunately, there is a simple, industry-standard notation specified by ITU-T E.123. The significance of this is that EPP-style international phone numbers are increasingly used and recognized, and therefore provide a good alternative format for storing (and validating) international phone numbers. NNNNNNNNNNx EEEE, where C is the 1–3 digit country code, N is up to 14 digits, and E is the (optional) extension.Users get very frustrated if they are told their valid numbers are not acceptable.According to E.164 international number can be 15 digits long and has no minimum length, other than the country code - at least one digit, and the subscriber number - at least one digit (shortest I've seen is three digits). The shortest one I've found so far was from NZ and was 5 digits long: 64010.For instance, this chapter introduces you to a number of utilities—some of them created by the authors, Jan and Steven—that let you test and debug a regular expression before you bury it in code where errors are harder to find.