JSFiddle - React, Tailwind, and code Playground

HTML

<input class="search"><div class="btn">Search</div>
    <br />
    <span class="result"></span>
    <div>Ion</div>
    <div>Vasile</div>
    <div>caca</div>
    <div>mar</div>
    <div>mar</div>

CSS

.succes{
  color:red;
}
.btn{
    display:inline;
    cursor:pointer;
    border:1px solid #000;
    width:100px;
}

JavaScript

'use strict';

    $('.btn').on('click', function(e){
        e.preventDefault();
        $('*').removeClass('succes');
        searchKey();   
    });
function searchKey(){
 var keyword = $('.search').val();
    
var place = $( "body" ).text().match(new RegExp(keyword, 'g'));

    if(place.length > 0)
    {
        alert(1)
       $('.result').html('S-au gasit <b>'+place.length+ '</b> rezultate!');
        result.addClass('succes')
    }
    else
    {
        $('.result').html('Nici un rezultat pt.: '+keyword);
    }
}