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})$/What this pattern does
This page provides a comprehensive, battle-tested regular expression for matching french phone number, ported and verified for Go. A rigorously tested regex reduces debugging time and protects your application from edge-case failures. The snippet below is ready to drop into your Go project — whether you're validating in a Gin handler, a gRPC service, or a command-line tool.
Go Implementation
// French Phone Number
// ReDoS-safe | RegexVault — Localization > Phone Numbers
package validation
import "regexp"
var frenchPhoneNumberRe = regexp.MustCompile(`^(?:\+33[\s.-]?|0)(1|[2-9])[\s.-]?([0-9]{2})[\s.-]?([0-9]{2})[\s.-]?([0-9]{2})[\s.-]?([0-9]{2})$`)
func ValidateFrenchPhoneNumber(s string) bool {
return frenchPhoneNumberRe.MatchString(s)
}
// Example
// fmt.Println(ValidateFrenchPhoneNumber("+33 1 42 34 56 78")) // trueTest 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 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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