JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" id="input"/>
<ul id="list">
    <li>Rich</li>
    <li>Rajim</li>
</ul>

JavaScript

var lis = $("#list li");
var list = $.makeArray(lis.map(function(k, v) {
    return $(v).text().toLowerCase();
}));


$("#input").keyup(function() {
    var userInput = $(this).val();
    lis.each(function(index, value) {
        $(value).toggle(list[index].indexOf(userInput) >= 0);
    });
});