JSFiddle - React, Tailwind, and code Playground

HTML

<input id="input1" type="text" />

CSS

4

JavaScript

$('#input1').keyup(function(){
    var val = $(this).val().match(/\d+([.]\d{1,2,3,4,5,6,7})?/);
    val = val == null || val.length == 0 ? "" : val;
    $(this).val(val);
});