const
    /**
         * Letters (a-z), numbers (0-9), and periods (._-) are allowed.
         * Can't start or end with periods. Contains at least 2 letters before and after (@).
         * Sub-domains with two characters are allowed.
         */
        email: /^([a-z\d]+[._-]?[a-z\d]+)+@[a-z\d]+[-]?[a-z\d]+(\.[a-z\d]{2,})+$/i,

        /**
         * Minimum 8 characters, including numbers and letters in both registers.
         * Examples:
         *  – ThisIsMyPassword1
         *  – qweRt123
         *  ...
         */
        password: /^(?=.*[a-z])(?=.*[A-Z])(?=.*[0-9])(?=.{8,})/,

        /**
         * Phone number from 9 to 10 digits, with or without country code separated with space.
         * Country code with leading (00) or (+).
         * Examples:
         *  – 0034 654123789
         *  – +34 654123789
         *  – 654123789
         */
        phone: /^((\+|00)[1-9]{1,3} )?[0-9]{9,10}$/,

        /**
         * Single or multiple surnames separated with spaces.
         * Minimum 2 letters, accent characters allowed.
         * Examples:
         *  – Lopez Martín
         *  – Smith
         *  – Li
         */
        surnames: /^(([A-zÀ-ÿ]{2,}|[A-Z].) ?)?$/,

        /**
         * Single or multiple names separated with spaces.
         * Minimum 2 letters, accent characters allowed.
         * Examples:
         *  – José Antonio
         *  – John
         *  – Wu
         */
        name: /^(([A-zÀ-ÿ]{2,}|[A-Z].) ?)?$/,

        /**
         * Letters (a-z), numbers (0-9), and periods (_-) are allowed.
         * Minimum 3 characters.
         * Examples:
         *  – jane_doe-9
         *  – JA-lopez
         *  – abc
         */
        username: /^[a-zA-Z0-9\-_]{3,}$/;