NPWP Formatting

<div id="coba">
                                <input class="form-control" v-model="form.npwp" v-validate="'required'" name="npwp" type="text" @input="acceptNumber" required>
                                <div v-show="errors.has('npwp')" class="form-control-feedback">{{ errors.first('npwp') }}</div>

                            </div>

methods: {
            acceptNumber() {
                var x = this.form.npwp.replace(/\D/g, '').match(/(\d{0,2})(\d{0,3})(\d{0,3})(\d{0,1})(\d{0,3})(\d{0,3})/)
                this.form.npwp = !x[2] ? x[1] : x[1] + '.' + x[2] +
                          (x[3] ? '.' + x[3] + (x[4] ? '.' + x[4] + (x[5] ? '-' + x[5] + (x[6] ? '.' + x[6] : '') : '') : '') : '')
            }
        },

mounted() {
            let externalScript = document.createElement('script')
                externalScript.setAttribute('src', 'https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js')
                document.head.appendChild(externalScript)
           }