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Showing content from https://developer.mozilla.org/fr/docs/Web/JavaScript/Reference/Global_Objects/RegExp/flags below:

RegExp.prototype.flags - JavaScript | MDN

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La propriété flags renvoie une chaîne de caractères contenant les drapeaux (flags) de l'objet RegExp auquel elle appartient.

// Outputs RegExp flags in alphabetical order

console.log(/foo/gi.flags);
// Expected output: "gi"

console.log(/bar/muy.flags);
// Expected output: "muy"

Les drapeaux de la propriété flags sont rangés par ordre alphabétique de gauche à droite.

/toto/gi.flags; // "gi"
/truc/muy.flags; // "muy"

if (RegExp.prototype.flags === undefined) {
  Object.defineProperty(RegExp.prototype, "flags", {
    configurable: true,
    get: function () {
      return this.toString().match(/[gimuy]*$/)[0];
    },
  });
}

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