What does the French Phone Number regex match?

Matches a French metropolitan phone number in domestic or international format.

How is the French Phone Number regex checked for ReDoS risk?

Manually audited and tested against ReDoS attack strings. Anchors and possessive-style constraints prevent runaway backtracking paths. RegexVault runs ReDoS-oriented static analysis and timed stress runs against adversarial inputs before publishing a pattern. That is audit evidence, not a guarantee for every engine and input — test the pattern against your own data before using it on untrusted traffic.

How do I use this regex in php?

// No imports required — PCRE is built into PHP $pattern = '/^(?:\+33[\s.-]?|0)(1|[2-9])[\s.-]?([0-9]{2})[\s.-]?([0-9]{2})[\s.-]?([0-9]{2})[\s.-]?([0-9]{2})$/'; $is_valid = (bool) preg_match($pattern, $input);

Localization/Phone Numbers

ReDoS Checked

French Phone Number Regex for PHP

/^(?:\+33[\s.-]?|0)(1|[2-9])[\s.-]?([0-9]{2})[\s.-]?([0-9]{2})[\s.-]?([0-9]{2})[\s.-]?([0-9]{2})$/

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What this pattern does

This page provides a comprehensive, battle-tested regular expression for matching french phone number, ported and verified for PHP. A rigorously tested regex reduces debugging time and protects your application from edge-case failures. The snippet below is ready to drop into your PHP project — whether you're validating in a Laravel validator, a WordPress plugin, or a standalone PHP script.

Php Implementation

Php

<?php
// French Phone Number
// ReDoS-checked | RegexVault — Localization > Phone Numbers

define('FRENCH_PHONE_NUMBER_PATTERN', '/^(?:\+33[\s.-]?|0)(1|[2-9])[\s.-]?([0-9]{2})[\s.-]?([0-9]{2})[\s.-]?([0-9]{2})[\s.-]?([0-9]{2})$/');

function validate_french_phone_number(string $input): bool {
    return (bool) preg_match(FRENCH_PHONE_NUMBER_PATTERN, $input);
}

// Example
var_dump(validate_french_phone_number("+33 1 42 34 56 78")); // bool(true)

Test Cases

Matches (Valid)	Rejects (Invalid)
`+33 1 42 34 56 78`	`+33 0 42 34 56 78`
`01 42 34 56 78`	`42 34 56 78`
`+33612345678`	`+44 1 42 34 56 78`
`06 12 34 56 78`	`01 42 34 567`
`09 12 34 56 78`	—

When to use this pattern

This pattern is drawn from the Localization > Phone Numbers category and has been checked for ReDoS risk. That matters for PHP developers because especially relevant in PHP where PCRE backtracking limits can trigger silent failures on malicious input. RegexVault audits patterns against known backtracking attack vectors, ensuring you have the necessary context before using this regex in a high-stakes production environment.

Common Pitfalls

French overseas territories (DOM-TOM) use different prefixes — Réunion is +262, Guadeloupe/Martinique/French Guiana are +596/+594, New Caledonia is +687. These are not matched by this pattern.

Technical Notes

French numbers are always 10 digits in domestic format (excluding leading 0). Zones: 01 (Paris), 02 (northwest), 03 (northeast), 04 (southeast), 05 (southwest), 06-07 (mobile), 08 (special), 09 (VoIP). +33 replaces the leading 0.

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