Vuetify Text Field Allow 10 digit Number

<!DOCTYPE html>
<html>

<body>
    <div id="app">
        <v-app>
            <v-main>
                <v-container>
                    <h3>Vuetify Text Field Allow 10 digit Number</h3>
                    <v-form @submit.prevent="register">
                        <v-text-field v-model="phoneNumber" label="Phone Number" :rules="phoneNumberRules"></v-text-field>
                    </v-form>
                </v-container>
            </v-main>
        </v-app>
    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue@2.x"></script>
    <script src="https://cdn.jsdelivr.net/npm/vuetify@2.x"></script>
    <script>
        new Vue({
            el: '#app',
            vuetify: new Vuetify(),
        data() {
                return {
                    phoneNumber: "",
                };
            },
            methods: {
                validatePhoneNumber(value) {
                    if (!value) return "Phone number is required";
                    if (!/^\d{10}$/.test(value)) return "Phone number must be a 10-digit number";
                    return true;
                },
            },
            computed: {
                phoneNumberRules() {
                    return [
                        (v) => this.validatePhoneNumber(v) || "Invalid phone number",
                    ];
                },
            },
        });
    </script>
</body>

</html>

xxxxxxxxxx
 
<!DOCTYPE html>
<html>
​
<head>
    <link href="https://fonts.googleapis.com/css?family=Roboto:100,300,400,500,700,900" rel="stylesheet">
    <link href="https://cdn.jsdelivr.net/npm/@mdi/font@6.x/css/materialdesignicons.min.css" rel="stylesheet">
    <link href="https://cdn.jsdelivr.net/npm/vuetify@2.x/dist/vuetify.min.css" rel="stylesheet">
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no, minimal-ui">
</head>
​
<body>
    <div id="app">
        <v-app>
            <v-main>
                <v-container>
                    <h3>Vuetify Text Field Allow 10 digit Number</h3>
                    <v-form @submit.prevent="register">
                        <v-text-field v-model="phoneNumber" label="Phone Number" :rules="phoneNumberRules"></v-text-field>
                    </v-form>
                </v-container>
            </v-main>
        </v-app>
    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue@2.x"></script>
    <script src="https://cdn.jsdelivr.net/npm/vuetify@2.x"></script>
    <script>
        new Vue({
            el: '#app',
            vuetify: new Vuetify(),
        data() {
                return {
                    phoneNumber: "",
                };
            },
            methods: {
                validatePhoneNumber(value) {
                    if (!value) return "Phone number is required";
                    if (!/^\d{10}$/.test(value)) return "Phone number must be a 10-digit number";
                    return true;
                },
            },
            computed: {
                phoneNumberRules() {
                    return [
                        (v) => this.validatePhoneNumber(v) || "Invalid phone number",
                    ];
                },
            },
        });
    </script>
</body>
​
</html>