If the second number is omitted, but the comma is present, there is no upper limit; if the second number and the comma are both omitted, the quantifierIf the second number is omitted, but the comma is present, there is no upper limit; if the second number and the comma are both omitted, the quantifier specifies an exact number of required matches.
Par exemple: accepte n'importe quelle succession d'au moins 3 voyelles minuscules, tandis que \d{d} n 'accepte que 8 chiffres exactement.