Regex for Phone Numbers: US, International, E.164
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. --- The Core Problem With Phone Regex Phone numbers don't have a single global format. The US uses . Germany uses . India uses . Japan uses . No single regex can validate all of these without becoming unmaintainable. The right approach is to pick the format you actually need to validate and write a targeted pattern for it. Don't try to write "the…
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