Regex for International Phone Numbers — Pattern Explained with Examples

In this tutorial, you'll learn about Regex for International Phone Numbers. We cover key concepts, practical examples, and best practices to help you understand and apply this topic effectively.

International phone number validation is critical for global applications. The E.164 standard defines a max 15-digit format starting with a country code. This pattern validates that a number has the correct basic structure: a plus sign, a valid country code digit, and up to 14 additional digits.

The Pattern

/^\+[1-9]\d{1,14}$/

Pattern Breakdown

Matches

• +14155551234
• +442071838750
• +911234567890
• +61299999999
• +33123456789

Does NOT Match

• 555-1234 (no plus sign or country code)
• +1555 (too few digits after country code)
• 0014155551234 (uses 00 prefix instead of +)
• +1(415)555-1234 (contains non-digit characters)
• +abc123 (contains letters)

Language Examples

JavaScript

const intlPhoneRegex = /^\+[1-9]\d{1,14}$/;
console.log(intlPhoneRegex.test('+14155551234'));  // true
console.log(intlPhoneRegex.test('555-1234'));       // false

Python

import re
pattern = r'^\+[1-9]\d{1,14}$'
print(bool(re.match(pattern, '+14155551234')))   # True
print(bool(re.match(pattern, '555-1234')))        # False

Go

package main

import (
	"fmt"
	"regexp"
)

func main() {
	re := regexp.MustCompile(`^\+[1-9]\d{1,14}$`)
	fmt.Println(re.MatchString("+14155551234"))  // true
	fmt.Println(re.MatchString("555-1234"))       // false
}

Common Pitfalls

• Country codes vary from 1 to 4 digits — this pattern does not validate specific country codes
• E.164 limits the total number to 15 digits including the country code, but some countries have shorter local numbers
• Phone number extensions are non-standard globally and require separate handling
• Local formatting conventions (spaces, parentheses, dashes) must be stripped before validation

Real-World Use Cases

• Global SaaS signup forms — accept user phone numbers from any country for account creation
• SMS notification systems — validate numbers before sending international messages via third-party APIs
• Contact synchronization — normalize phone data from global address books into a uniform E.164 format

FAQ

Related Patterns

Regex for US Phone Numbers Regex for Email