French company identifier, nine digits in groups of three. The lookahead is what makes it composable: a SIRET is a SIREN followed by five more digits, and without it the shorter SIREN wins the shared start and shreds every SIRET. Declare fr-siret first all the same, so an establishment number is read as one.
Label: FR_SIREN
\b\d{3}[\s-]?\d{3}[\s-]?\d{3}\b(?![\s-]?\d)Le numéro SIREN 732 829 320 permet de retrouver la société sur l'annuaire. → 732 829 320SIREN 552081317 pour la société mère. → 552081317732 829 320 0007412 345Tags: fr, business, accounting, finance