Q: How do I use the US Phone Number regex in JavaScript?

Use the pattern /(?:\+?1[-\s.]?)?$?\d{3}$?[-\s.]?\d{3}[-\s.]?\d{4}/g with the String.match() or String.matchAll() method. For example: const matches = text.match(/(?:\+?1[-\s.]?)?$?\d{3}$?[-\s.]?\d{3}[-\s.]?\d{4}/g);

Question 1

What does the US Phone Number regex pattern do?

Accepted Answer

Matches US phone numbers with optional country code (+1), area code with optional parentheses, and groups separated by hyphens, spaces, or dots.

Question 2

How do I use the US Phone Number regex in JavaScript?

Accepted Answer

Use the pattern /(?:\+?1[-\s.]?)?$?\d{3}$?[-\s.]?\d{3}[-\s.]?\d{4}/g with the String.match() or String.matchAll() method. For example: const matches = text.match(/(?:\+?1[-\s.]?)?$?\d{3}$?[-\s.]?\d{3}[-\s.]?\d{4}/g);

Question 3

What regex flags does this pattern use?

Accepted Answer

This pattern uses the global flag (g). The global flag finds all matches in the input, not just the first.

Question 4

Which programming languages support this regex?

Accepted Answer

Fully supported in JS, PYTHON, JAVA, PHP, GO, RUBY, CSHARP

Question 5

What strings does this regex match?

Accepted Answer

This pattern matches strings like: (555) 123-4567, +1-555-123-4567, 555.123.4567. It does not match strings like: 123-456, 555-1234-567, abc-def-ghij.

Question 6

When should I use the US Phone Number regex?

Accepted Answer

Use this pattern to validate or extract US phone numbers from form inputs, contact pages, or text content. It handles the most common formats: (555) 123-4567, 555-123-4567, 555.123.4567, and +1-555-123-4567. This pattern does not validate whether the area code is actually assigned. For production phone validation with international support, consider a library like libphonenumber.

Question 7

What are common mistakes with the US Phone Number regex?

Accepted Answer

A common mistake is: Using \d{10} to match any 10 consecutive digits. Instead, use (?:\+?1[-\s.]?)?$?\d{3}$?[-\s.]?\d{3}[-\s.]?\d{4} because A flat \d{10} matches any 10-digit sequence including zip codes, serial numbers, and other non-phone data. A structured pattern with separators is far more precise.. A common mistake is: Requiring parentheses around the area code. Instead, use $?\d{3}$? because Not all US phone formats use parentheses. Making them optional with $? and $? ensures the pattern matches both (555) 123-4567 and 555-123-4567.. A common mistake is: Only allowing hyphens as separators. Instead, use [-\s.]? because US phone numbers are commonly written with dots (555.123.4567), spaces (555 123 4567), or no separators (5551234567) in addition to hyphens.

Question 8

How does the US Phone Number regex work step by step?

Accepted Answer

`(?:\+?1[-\s.]?)?` — Optionally match the US country code: an optional +, the digit 1, and an optional separator (hyphen, space, or dot). `$?` — Match an optional opening parenthesis before the area code. `\d{3}` — Match exactly 3 digits — the area code (e.g., 555). `$?` — Match an optional closing parenthesis after the area code. `[-\s.]?` — Match an optional separator: hyphen, whitespace, or dot. `\d{3}` — Match exactly 3 digits — the central office (exchange) code. `[-\s.]?` — Match an optional separator between the exchange and subscriber number. `\d{4}` — Match exactly 4 digits — the subscriber (line) number

Token	Explanation
`(?:\+?1[-\s.]?)?`	Optionally match the US country code: an optional +, the digit 1, and an optional separator (hyphen, space, or dot)
`\(?`	Match an optional opening parenthesis before the area code
`\d{3}`	Match exactly 3 digits — the area code (e.g., 555)
`\)?`	Match an optional closing parenthesis after the area code
`[-\s.]?`	Match an optional separator: hyphen, whitespace, or dot
`\d{3}`	Match exactly 3 digits — the central office (exchange) code
`[-\s.]?`	Match an optional separator between the exchange and subscriber number
`\d{4}`	Match exactly 4 digits — the subscriber (line) number

Language	Support
JS	Full support
PYTHON	Full support
JAVA	Full support
PHP	Full support
GO	Full support
RUBY	Full support
CSHARP	Full support

US Phone Number

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Related Patterns

International Phone Number (E.164)

UK Phone Number

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