mask.js

const multiSplit = (str, delimeters) => {
  let right = str;
  const result = [];

  for (let i = 0; i < delimeters.length; i++) {
    const indexDel = right.indexOf(delimeters[i]);
    if (indexDel === -1) continue;
    result.push(right.slice(0, indexDel));
    right = right.slice(indexDel + 1);
  }

  result.push(right);

  return result;
};


const maskParse = () => {
  let isDel = false;
  let prevValue = "";
  return (mask, validate, value) => {
    isDel = prevValue.length > value.length;

    const delimeters = validate.filter(m => !(m instanceof RegExp));
    const regexps = validate.filter(m => m instanceof RegExp);
    const target = multiSplit(value, delimeters);
    const masks = multiSplit(mask, delimeters);

    const isValid = target.every((partText, i) => regexps[i].test(partText));

    if (isValid) {
      const valueWithMask = target.reduce((acc, part, i) => {
        if (part.length === masks[i].length && isDel === true && i === target.length-1) {
          return acc + part.slice(0, -1)
        }
        else if (part.length === masks[i].length) {
          return delimeters[i] !== undefined
            ? acc + part + delimeters[i]
            : acc + part
        }
        else {
          return acc + part
        }
      }, '')

      prevValue = valueWithMask

      return [
        true,
        valueWithMask
      ]
    }

    return [
      false,
      value
    ];
  };
};

const ms = maskParse();