🔍Regex Recipes

Phone Number (E.164 International)

Validate international phone numbers in E.164 format (+country code without spaces).

Pattern

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

Explanation

E.164 format: + followed by 1-15 digits total (country code + number). No spaces or special characters.

Examples

US number

Input

+14155552671

Output

✓ Match

UK number

Input

+442071234567

Output

✓ Match

Serbia

Input

+381112345678

Output

✓ Match

Invalid - no plus

Input

14155552671

Output

✗ No match

Invalid - has spaces

Input

+1 415 555 2671

Output

✗ No match

Code Examples

JavaScript

const e164Regex = /^\+[1-9]\d{1,14}$/;

function validateE164(phone) {
  return e164Regex.test(phone);
}

// Convert formatted to E.164
function toE164(phone, defaultCountry = '+1') {
  // Remove all non-digits except leading +
  let cleaned = phone.replace(/[^\d+]/g, '');
  if (!cleaned.startsWith('+')) {
    cleaned = defaultCountry + cleaned;
  }
  return cleaned;
}

Try it Now

Open in Regex Tester

💡 Tips

Use libphonenumber library for production
Strip formatting before validation
Store in E.164, display in local format
Provide format examples to users

⚠️ Common Pitfalls

E.164 is strict - no spaces, dashes, parentheses
Users often enter formatted numbers
Country code required (no local numbers)
Maximum 15 digits total including country code