Regex for Phone Numbers: Match US, International, and E.164 Formats
Write regex patterns for phone numbers: US formats, E.164 international, extensions, and dashes. Includes test cases and validation strategy.
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Tags: developer-tools, regex, validation
Regex for Phone Numbers: Match US, International, and E.164 Formats Phone number validation is one of the most requested regex use cases — and one of the easiest to get wrong. A pattern that works for US numbers breaks on UK numbers. A pattern that handles international format fails on extensions. This article gives you working patterns for every major format, explains exactly why they work, and tells you when to stop using regex altogether. US Phone Numbers US phone numbers follow the NANP (North American Numbering Plan): a 3-digit area code + 3-digit exchange + 4-digit subscriber number. The total is always 10 digits (or 11 with the leading ). Basic US Format (10 digits, various separators) This matches: How it works: — optional country code or , followed by an optional separator — area…
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