feat: add fr-FR license plate validator#2806
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tux-tn
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Jul 15, 2026
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Thank you for your PR
The official ANTS documentation (https://immatriculation.ants.gouv.fr/tout-savoir/numero-logo-et-plaque) (In french) states that the SIV format excludes I, O, and U, and also prohibits the two-letter combination SS:
Une seule association de deux lettres est interdite, SS…
The current regex excludes I/O/U but accepts SS, for example SS-123-AA and AA-123-SS. Could you update the validator and add regression tests covering SS in both letter-pair positions?
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short description of the changes for this issue:
isLicensePlate: Added support for France (fr-FR), validating French SIV license plates (2 letters, 3 digits, 2 letters, excluding the characters I, O, and U to avoid optical confusion).
Documentation & Tests: Updated README.md to list fr-FR as a supported locale, and added unit tests in test/validators.test.js covering valid (e.g., AB-123-CD, AB123CD) and invalid (e.g., AI-123-BB, ab-123-cd) formats.