Phone Number Regex Java Validator

What is a Phone Number Regex?

Phone numbers can appear in many formats, especially when supporting multiple countries. A regex (regular expression) helps match these patterns to ensure users enter valid contact numbers.

In Java, regex patterns for phone numbers commonly validate:

• Optional country codes (e.g., +91, +1)

• Numeric-only formats (e.g., 9876543210)

• Readable formats with dashes, spaces, or brackets (e.g., (123) 456-7890)

  
  

Core Features

• Validates local and international phone numbers

• Supports formats with country codes, dashes, spaces, or brackets

• Helps improve data accuracy and prevent invalid submissions

• Java regex pattern preview and test output

• Real-time feedback for validation

  
  

Common Regex Patterns

1. Simple 10-digit number:

   
   Matches: 9876543210

   ^\d{10}$

   
   

2. International number with optional country code:
   

   Matches: +919876543210, 19876543210

   ^\+?[1-9]{1}[0-9]{7,14}$

   
   

3. Formatted US-style number:

   
   

   Matches: (123) 456-7890, 123-456-7890, 1234567890

   ^\(?\d{3}\)?[- ]?\d{3}[- ]?\d{4}$

How It Works

1. Enter your phone number in the input field.

2. Choose the regex pattern you want to test against.

3. The tool checks if your input matches and displays the result.

4. Use the output to validate real-time form entries or clean up datasets.

   
   

Example Code (Java)

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

public class PhoneNumberValidator {
    public static void main(String[] args) {
        String phoneNumber = "+1-234-567-8901";
        String regex = "^\\+?[1-9]{1}[0-9]{7,14}$";

        Pattern pattern = Pattern.compile(regex);
        Matcher matcher = pattern.matcher(phoneNumber);

        if (matcher.matches()) {
            System.out.println("Phone number is valid.");
        } else {
            System.out.println("Phone number is invalid.");
        }
    }
}

Pro Tips

• Use ^ and $ to anchor the pattern to the start and end of the string.

• Avoid overly strict regex for global apps—formats differ across countries.

• Use different regex patterns for validation and formatting (e.g., display vs input).

• Combine with form validation libraries for enhanced UX.

• For data imports, combine this tool with CSV to JSON Converter to clean phone numbers in bulk.

• For backend APIs, use this alongside the Java UUID Validator to validate user sessions.

Combine with These Tools

• Email Regex Java Validator — Validate user emails in the same system.

• UUID Regex Java Validator — Confirm identity tokens during authentication.

• Date Regex Java Validator — Ensure date formats in form fields are valid.

• Base64 Encoder — Encode sensitive information like phone numbers if needed.