REGEXVAULTv2.0
Localization/Phone Numbers
Verified Safe

French Phone Number Regex for Go

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

What this pattern does

This page provides a comprehensive, battle-tested regular expression for matching french phone number, ported and verified for Go. A rigorously tested regex reduces debugging time and protects your application from edge-case failures. The snippet below is ready to drop into your Go project — whether you're validating in a Gin handler, a gRPC service, or a command-line tool.

Go Implementation

Go
// French Phone Number
// ReDoS-safe | RegexVault — Localization > Phone Numbers

package validation

import "regexp"

var frenchPhoneNumberRe = regexp.MustCompile(`^(?:\+33[\s.-]?|0)(1|[2-9])[\s.-]?([0-9]{2})[\s.-]?([0-9]{2})[\s.-]?([0-9]{2})[\s.-]?([0-9]{2})$`)

func ValidateFrenchPhoneNumber(s string) bool {
    return frenchPhoneNumberRe.MatchString(s)
}

// Example
// fmt.Println(ValidateFrenchPhoneNumber("+33 1 42 34 56 78")) // true

Test Cases

Matches (Valid)
Rejects (Invalid)
+33 1 42 34 56 78+33 0 42 34 56 78
01 42 34 56 7842 34 56 78
+33612345678+44 1 42 34 56 78
06 12 34 56 7801 42 34 567
09 12 34 56 78

When to use this pattern

This pattern is drawn from the Localization > Phone Numbers category and carries a ReDoS-safe certification. That matters for Go developers because Go's RE2 engine is inherently safe from catastrophic backtracking, but this pattern has been additionally verified for correctness. 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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