JSFiddle - React, Tailwind, and code Playground

HTML

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

JavaScript

function replaceAll(find, replace, str) {
  return str.replace(new RegExp(find, 'g'), replace);
}

$(document).ready(function(){
    $('#metin').keyup(function(){
        var metin = $('#metin').val();
        if(metin.indexOf('%') >= 0)
        {
            $('#metin').val(replaceAll('%',' ',metin));
        }
    });

});