console.log("asd123fgh".replace(/\d*/, "z")); // "asdzfgh" - ожидаемо
console.log("asd123fgh".replace(/\d*/, "z")); // "zasd123fgh" - неожиданно
console.log("asd123fgh".replace(/\w+/g, "z")); // "z" - ожидаемо
console.log("asd123fgh".replace(/\w*/g, "z")); // "zz" - неожиданно
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