Regex for US Phone Numbers — Pattern Explained with Examples

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

US phone number validation is essential for forms and contact management systems targeting North American users. This pattern handles the common formatting variations: area code in parentheses, dashes, dots, spaces, and the optional leading 1 country code.

The Pattern

/^\+?1?\s?\(?[0-9]{3}\)?[-.\s]?[0-9]{3}[-.\s]?[0-9]{4}$/

Pattern Breakdown

Matches

• (555) 123-4567
• 555-123-4567
• +1 555 123 4567
• 555.123.4567
• 15551234567

Does NOT Match

• 123-4567 (missing area code)
• 555-123-456 (line number only 3 digits)
• +44 555 123 4567 (UK country code)
• 555-ABCD-EFG (letters in number)
• (555)123-4567 extra (trailing characters)

Language Examples

JavaScript

const phoneRegex = /^\+?1?\s?\(?[0-9]{3}\)?[-.\s]?[0-9]{3}[-.\s]?[0-9]{4}$/;
console.log(phoneRegex.test('(555) 123-4567')); // true
console.log(phoneRegex.test('123-4567'));       // false

Python

import re
pattern = r'^\+?1?\s?\(?[0-9]{3}\)?[-.\s]?[0-9]{3}[-.\s]?[0-9]{4}$'
print(bool(re.match(pattern, '(555) 123-4567')))  # True
print(bool(re.match(pattern, '123-4567')))         # False

Ruby

pattern = /^\+?1?\s?\(?[0-9]{3}\)?[-.\s]?[0-9]{3}[-.\s]?[0-9]{4}$/
puts pattern.match?('(555) 123-4567')  # true
puts pattern.match?('123-4567')        # false

Common Pitfalls

• This pattern does not validate that the area code is a real US area code — (000) 000-0000 passes
• International formats starting with country codes other than +1 will be incorrectly rejected
• Phone number extensions (e.g. x123) are not supported without additional pattern modifications
• Accepting the leading 1 inconsistently can cause duplicate records in databases

Real-World Use Cases

• E-commerce checkout forms — collect valid US billing and shipping contact numbers
• CRM systems — normalize and store customer phone data from multiple input sources
• Two-factor authentication — validate phone format before sending SMS verification codes

FAQ

Related Patterns

Regex for International Phone Numbers Regex for Email