US Phone Number Validation Regex (10 Digits Only)

A strict regex pattern for validating US phone numbers with exactly 10 digits and no formatting characters.

Pattern Breakdown

^\d{10}$

Components

Character Classes

• \d - Any digit (0-9)
• {10} - Quantifier: exactly 10 occurrences

Examples

Valid:

• 5551234567
• 8005551234
• 2125551234
• 0000000000 (format valid, though not a real number)

Invalid:

• 555-123-4567 (contains dashes)
• (555) 123-4567 (contains parentheses and spaces)
• 555123456 (only 9 digits)
• 55512345678 (11 digits)
• 555 123 4567 (contains spaces)
• 555.123.4567 (contains dots)

Implementation

JavaScript

const phoneRegex = /^\d{10}$/;
phoneRegex.test('5551234567'); // true
phoneRegex.test('8005551234'); // true
phoneRegex.test('555-123-4567'); // false (contains formatting)
phoneRegex.test('555123456'); // false (only 9 digits)

Python

import re
phone_regex = r'^\d{10}$'
bool(re.match(phone_regex, '5551234567'))  # True
bool(re.match(phone_regex, '8005551234'))  # True
bool(re.match(phone_regex, '555-123-4567'))  # False (contains formatting)

Go

phoneRegex := regexp.MustCompile(`^\d{10}$`)
phoneRegex.MatchString("5551234567") // true
phoneRegex.MatchString("8005551234") // true
phoneRegex.MatchString("555-123-4567") // false (contains formatting)

Limitations

1. No formatting allowed: Requires pre-processing to remove formatting
2. No country code: Doesn't support +1 prefix
3. No area code validation: Accepts invalid area codes like 000 or 111
4. No extension support: Doesn't handle extensions
5. Strict format: Users must strip formatting before input

When to Use

• When you normalize phone numbers before validation
• Database storage format validation
• After removing formatting characters
• When you want strict, no-formatting validation
• API input validation after sanitization

For production, consider:

• Pre-processing: remove all non-digit characters before validation
• Adding area code validation
• Storing normalized format in database
• Displaying formatted version to users