javascript document word search and count

1var input = document.getElementById('typed-text');
2
3input.onkeydown = function (e) {
4
5    if (e.keyCode === 13) {
6
7        var paragraph = document.getElementById('paragraph');
8        var result = document.querySelector('.result-output');
9        var regexp = new RegExp(this.value, 'g');
10        var textIncludes = paragraph.textContent.match(regexp);
11            
12        if (result)
13            result.remove();
14
15        paragraph.innerHTML = paragraph.textContent.replace(
16            regexp,
17            '<span style="color:red">' + this.value + '</span>');
18
19        paragraph.insertAdjacentHTML(
20            'afterend',
21            '<span class="result-output" style="display: block; padding: 5px; margin-top: 10px; background: #eee; color: green;">' + (textIncludes ? textIncludes.length : 0) + ' words has been found.</span>');
22            
23    }
24
25}
26<div id="highlights">
27        <div class="container">
28            <div class="row">
29                <div class="col-md-12" id="paragraph">
30                    <p>
31                       text
32                    </p>
33                </div>
34                <div class="col-md-12 input-group mt-3">
35                    <div class="input-group-prepend">
36                        <span class="input-group-text" id="basic-addon1">
37                            <i class="fas fa-pencil-alt"></i>
38                        </span>
39                    </div>
40                    <input id="typed-text" type="text" class="form-control" placeholder="Type text">
41                </div>
42            </div>
43        </div>
44    </div>
45

1return str.split(' ').length;
2