JSFiddle - React, Tailwind, and code Playground

by Dmitri Ganenco

HTML

<input type="text" id="txtChar" name="txtChar" class="CsstxtChar" maxlength="4"/>

JavaScript

const pattern = new RegExp('[0-9.]');

$('#txtChar').on('keypress', function(e){
debugger;
	const res =	pattern.test(e.key);
	if(!res) {
		e.preventDefault();
	}
});