Javascript number mask

mask.js

const mask = (res = "", regex) => {
   if (res.replace(/\D+/gim, "").length == 0) return "";
   if (res.replace(/\D+/gim, "").length > regex.replace(/\D+/gim, "").length)
      return res.slice(0, regex.replace(/\[|\]/gim, "").length);
   let regexNumber = regex.match(/\d+/gim, ""), //sadece sayılar
      totalLen = res.match(/\d+/gim, "").join("").length, //gelen değerin uzunluğu
      number = res.match(/\d+/gim, "").join("") + new Array(regexNumber.join("").length - totalLen).fill("_").join(""),
      len = 0,
      rlen = 0;
   let match = regex.replace(/\[\d+\]/gim, (m, k) => m.replace(/\[\d+\]/gim, "$" + rlen++));
   regexNumber.map((i, k) => {
      match = match.replace("$" + k, number.slice(len, len + i.length));
      len = len + i.length;
   });
   return match.replace(/[\D]+$/gim, "");
};

maskExample.js

import React, { Component } from "react";
import TextField from "../components/ui/TextField";
import { View } from "react-native";
const phoneRegex = "+([000]) [000] [00] [00]";
const dateRegex = "[00]/[00]/[0000]";
const moneyRegex = "$[000],[00]";
export default class InputMask extends Component {
   state = { phone: "", date: "", money: "" };
   render() {
      return (
         <View style={{ padding: 12 }}>
            <TextField
               value={this.state.phone}
               label='Default Flat Input'
               autoFocus={true}
               onChangeText={res => {
                  let val = mask(res, phoneRegex);
                  this.setState({ phone: val });
               }}
               keyboardType='phone-pad'
            />
            <TextField
               value={this.state.date}
               label='Default Flat Input'
               onChangeText={res => {
                  let val = mask(res, dateRegex);
                  this.setState({ date: val });
               }}
               keyboardType='phone-pad'
            />
            <TextField
               value={this.state.money}
               label='Default Flat Input'
               onChangeText={res => {
                  let val = mask(res, moneyRegex);
                  this.setState({ money: val });
               }}
               keyboardType='phone-pad'
            />
         </View>
      );
   }
}