Maskit

Demo: burlakeugene.github.io/maskit

npm i --save maskit

0 - any number
A - any char
Ы - any cyrillic char
?+-()[]{}.,\\/-=_~`|'"  - autofilled chars, also you can wrap any symbol in brackets "{someChar}", and it will be autofilled
In other cases mask will be waiting for same char

<input type="text" data-maskit="+{7}(000) 000-00-00">
<input type="text" data-maskit="000 / 000">

document.querySelectorAll('input[data-maskit]').forEach((input, index) => {
  new Maskit(input, {
    mask: input.getAttribute('data-maskit'),
    notFilledClear: true,
    onFilled: scope => {},
    offFilled: scope => {},
    onBlur: scope => {},
    onChange: scope => {},
    onInit: scope => {}
    beforeChange: ({scope, value}) => {}
  });
});