Regex java номер телефона

In this article, we’ll learn how to validate mobile phone number of different country’s format using Java Regex (Regular Expressions)

Phone Number Format

A typical mobile phone number has following component:

+<country_code> <area_code> <subscriber_number>

Where depending on the country,

• country_code is somewhere between 1 to 3 digits
• area_code and subscriber_number combined is somewhere between 8 to 11 digits

If you simply require a regex to match all country format then here it is,

"^(\+\d{1,3}( )?)?((\(\d{1,3}\))|\d{1,3})[- .]?\d{3,4}[- .]?\d{4}$"

If you want to know **how we came up with this regex?** then please read this full article.

1. Regex to match 10 digit Phone Number with No space

This is simplest regex to match just 10 digits. We will also see here how to use regex to validate pattern:

String regex = "^\d{10}$";
Pattern pattern = Pattern.compile(regex);
Matcher matcher = pattern.matcher("9876543210");
matcher.matches(); // returns true if pattern matches, else returns false

Let’s break the regex and understand,

• ^ start of expression
• d{10} is mandatory match of 10 digits without any space
• $ end of expression

You can make regex more flexible to match between 8 to 11 digits phone number with no space, using this regex:

String noSpaceRegex = "^\d{8,11}$";

2. Regex to match 10 digit Phone Number with WhiteSpaces, Hyphens or No space

String spacesAndHyphenRegex = "^(\d{3}[- ]?){2}\d{4}$";

Let’s break the regex and understand,

• ^ start of expression
• d{3} is mandatory match of 3 digits
• [- ]? is optional match of whitespace or hyphen after 3 digits
• {2} is to repeat the above match d{3}[- ]? two times becomes total 6 digits
• d{4} is mandatory match of last 4 digits
• $ end of expression

3. Regex to match 10 digit Phone Number with Parentheses

String parenthesesRegex = "^((\(\d{3}\))|\d{3})[- ]?\d{3}[- ]?\d{4}$";

Let’s break the regex and understand,

• ^ start of expression
• (\(\d{3}\))|\d{3}) is mandatory match of 3 digits with or without parentheses
• [- ]? is optional match of whitespace or hyphen after after 3 digits
• \d{3}[- ]? is mandatory match of next 3 digits followed by whitespace, hyphen or no space
• \d{4} is mandatory match of last 4 digits
• $ end of expression

4. Regex to match 10 digit Phone number with Country Code Prefix

This regex is combined with regex to include parenthesis

String countryCodeRegex = "^(\+\d{1,3}( )?)?((\(\d{3}\))|\d{3})[- .]?\d{3}[- .]?\d{4}$";

Let’s break the regex and understand,

• ^ start of expression
• (\+\d{1,3}( )?)? is optional match of country code between 1 to 3 digits prefixed with + symbol, followed by space or no space.
• ((\(\d{3}\))|\d{3})[- .]?\d{3}[- .]?\d{4} is mandatory match of 10 digits with or without parenthesis, followed by whitespace, hyphen or no space
• $ end of expression

5. Regex to match Phone Number of All Country Formats

Before we start defining a regex, let’s look at some of the country phone number formats:-

Abkhazia    +995 442 123456
Afghanistan +93 30 539-0605
Australia   +61 2 1255-3456
China       +86 (20) 1255-3456
Germany     +49 351 125-3456
Indonesia   +62 21 6539-0605
Iran        +98 (515) 539-0605
Italy       +39 06 5398-0605
New Zealand +64 3 539-0605
Philippines +63 35 539-0605
Singapore   +65 6396 0605
Thailand    +66 2 123 4567
UK          +44 141 222-3344
USA         +1 (212) 555-3456
Vietnam     +84 35 539-0605

Let’s extract some information from these numbers:-

1. Country Code prefix starts with ‘+’ and has 1 to 3 digits
2. Last part of the number, also known as subscriber number is 4 digits in all of the numbers
3. Most of the countries have 10 digits phone number after excluding country code. A general observation is that all countries phone number falls somewhere between 8 to 11 digits after excluding country code.

Let’s see again on regex from previous example to validate country code:

String countryCodeRegex = "^(\+\d{1,3}( )?)?((\(\d{3}\))|\d{3})[- .]?\d{3}[- .]?\d{4}$"l

The above regex is to match 10 digit phone numbers, Let’s make some changes in this and make it more flexible to match 8 to 11 digits phone numbers:-

Regex to Match All Country Formats

String allCountryRegex = "^(\+\d{1,3}( )?)?((\(\d{1,3}\))|\d{1,3})[- .]?\d{3,4}[- .]?\d{4}$";

Let’s break the regex and understand,

• ^ start of expression
• (\+\d{1,3}( )?)? is optional match of country code between 1 to 3 digits prefixed with ‘+’ symbol, followed by space or no space.
• ((\(\d{1,3}\))|\d{1,3} is mandatory group of 1 to 3 digits with or without parenthesis followed by hyphen, space or no space.
• \d{3,4}[- .]? is mandatory group of 3 or 4 digits followed by hyphen, space or no space
• \d{4} is mandatory group of last 4 digits
• $ end of expression

6. Regex to match Phone Number of Specific Country Format

As you saw in the previous example that we have to add some flexibility in our regex to match all countries’ formats. If you want more strict validation of specific country format then here are examples of India and Singapore Phone number regex pattern:

String indiaRegex = "^(\+\d{2}( )?)?((\(\d{3}\))|\d{3})[- .]?\d{3}[- .]?\d{4}$";
String singaporeRegex = "^(\+\d{2}( )?)?\d{4}[- .]?\d{4}$";

В этом уроке мы рассмотрим, как проверить номер телефона в Java с помощью регулярных выражений (RegEx).

Телефонные номера трудно проверить. Разные страны имеют разные форматы, а некоторые страны даже используют несколько форматов и кодов стран.

Чтобы проверить номер телефона с помощью регулярных выражений, вам придется написать пару утверждений.

Эти утверждения зависят от вашего проекта, его локализации и стран, в которых вы хотите его применить.

Для стандартной проверки номера телефона в США мы можем использовать длинное, довольно надежное выражение:

^(+d{1,2}s)?(?d{3})?[s.-]?d{3}[s.-]?d{4}$

4 группы в выражении соответствуют коду страны, номеру региона, номеру абонента и добавочному номеру.

123-456-7890
(123) 456-7890
etc...

Вы можете написать другое выражение, введя набор правил для групп (в зависимости от страны) и форматов.

Pattern simplePattern = Pattern.compile("^\+\d{10,12}$");
Pattern robustPattern = Pattern.compile("^(\+\d{1,2}\s)?\(?\d{3}\)?[\s.-]?\d{3}[\s.-]?\d{4}$");

String phoneNumber = "+12 345 678 9012";

Matcher simpleMatcher = simplePattern.matcher(phoneNumber);
Matcher robustMatcher = robustPattern.matcher(phoneNumber);

if (simpleMatcher.matches()) {
    System.out.println(String.format("Simple Pattern matched for string: %s", phoneNumber));
}
if(robustMatcher.matches()) {
    System.out.println(String.format("Robust Pattern matched for string: %s", phoneNumber));
}

Robust Pattern matched for string: +12 345 678 9012

Совпадения здесь могли бы соответствовать нескольким форматам:

Pattern robustPattern = Pattern.compile("^(\+\d{1,2}\s)?\(?\d{3}\)?[\s.-]?\d{3}[\s.-]?\d{4}$");

List<String> phoneNumbers = List.of(
        "+12 345 678 9012",
        "+123456789012",
        "345.678.9012",
        "345 678 9012"
);

for (String number : phoneNumbers) {
    Matcher matcher = robustPattern.matcher(number);
    if(matcher.matches()) {
        System.out.println(String.format("Robust Pattern matched for string: %s", number));
    }
}

Результат:

Robust Pattern matched for string: +12 345 678 9012
Robust Pattern matched for string: 345.678.9012
Robust Pattern matched for string: 345 678 9012

Объединяем несколько регулярных выражений

Вместо единого универсального надежного регулярного выражения, охватывающего все крайние случаи, страны и т.д., вы можете выбрать несколько различных шаблонов, которые будут охватывать входящие телефонные номера. Чтобы упростить задачу – вы можете связать эти выражения с помощью оператора | , чтобы проверить, соответствует ли номер телефона какому-либо из шаблонов:

Pattern robustPattern = Pattern
        .compile(
                // Robust expression from before
                "^(\+\d{1,2}\s)?\(?\d{3}\)?[\s.-]?\d{3}[\s.-]?\d{4}$"
                // Area code, within or without parentheses,
                // followed by groups of 3-4 numbers with or without hyphens
                + "| ((\(\d{3}\) ?)|(\d{3}-))?\d{3}-\d{4}"
                // (+) followed by 10-12 numbers
                + "|^\+\d{10,12}"
);

List<String> phoneNumbers = List.of(
        "+12 345 678 9012",
        "+123456789012",
        "345.678.9012",
        "345 678 9012"
);

for (String number : phoneNumbers) {
    Matcher matcher = robustPattern.matcher(number);
    if(matcher.matches()) {
        System.out.println(String.format("Pattern matched for string: %s", number));
    }
}

Результат:

Pattern matched for string: +12 345 678 9012
Pattern matched for string: +123456789012
Pattern matched for string: 345.678.9012
Pattern matched for string: 345 678 9012

Заключение

Регулярные выражения могут решить проблему проверки телефонных номеров, но это сложно.

Некоторые страны придерживаются разных стандартов, в то время как некоторые страны принимают и используют несколько форматов одновременно. Это затрудняет написание выражения общего назначения для универсального соответствия телефонным номерам.

В этой статье мы рассмотрели, как сопоставлять телефонные номера с регулярными выражениями в Java, используя несколько различных выражений.

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A quick guide to how to validate phone numbers in java for different countries such as the USA, IN. Example programs with Regular Expression and Google libphonenumber API.

1. Introduction

In this tutorial, We’ll learn how to validate phone numbers in java. This is to validate mainly the USA and India country phone numbers but after seeing the example you can develop the validation rules for other countries.

This is a common requirement to verify mobile numbers as we do validation for email address validation but java does not have built-in capability to provide such methods. But, We can achieve this with the help of regular expression and google api with libphonenumber.

Let us jump into writing example programs.

2. Regular Expression

Regular expression implementation is a bit tricky because phone number has lots of formats with different extensions.

For example, here are some of the common ways of writing phone numbers for the
USA.

India:

9123124123

Phone Number Validation with Regular Expression

Output:

3. Google libphonenumber Example

If you go with the regex approach, you need to do lots of testing to cover all the corner cases. But, if we have some api that provides this functionality with proper testing that would be good to use in our application.

libphonenumber API is provided by Google as an opensource library that provides the functionalities such as parsing, formatting, validating and storing international phone numbers.

This API is optimized for running on smartphones and also used by the Android framework.

The main advantage of this API is that you can format or validate and parse any country or region mobile numbers.

Class PhoneNumberUtil is a utility for international phone numbers. Functionality includes formatting, parsing, and validation.

Output:

Another Example To Validate USA OR India Phone numbers:

Sample phone numbers

Output:

PhoneNumberUtil API

5. PhoneNumberType

This api supports all the below types of numbers.

PhoneNumberUtil.PhoneNumberType

6. Conclusion

In this article, We’ve seen how to validate phone numbers in java using regex and Google open-source api libphonenumber.

GitHub Code

Google API

Как проверить номер телефона в Java (регулярное выражение)

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class ValidatePhoneNumber {
  public static void main(String[] argv) {

      String sPhoneNumber = "605-8889999";
      //String sPhoneNumber = "605-88899991";
      //String sPhoneNumber = "605-888999A";

      Pattern pattern = Pattern.compile("\d{3}-\d{7}");
      Matcher matcher = pattern.matcher(sPhoneNumber);

      if (matcher.matches()) {
          System.out.println("Phone Number Valid");
      }
      else
      {
          System.out.println("Phone Number must be in the form XXX-XXXXXXX");
      }
 }
}