jak mogę uzyskać zawartość zakresu? Szukam sposobu, aby to wszystko było waniliowe, a nie jQuery

javascript (i trochę jQuery)

var swear_words_arr=new Array("bad","evil","freak");
var regex = new RegExp('\\b(' + swear_words_arr.join('|') + ')\\b', 'i' );

function validate_user_text() {
var text = document.getElementById('myInput');
text.text();

if(regex.test(text)) {
    window.location="http://www.newlocation.com";
    return false;
}

}
var myVar=setInterval(function(){validate_user_text()},1000);change

oto mój html

<div id="textArea">
<span id="myInput" contenteditable="true">kfjdkfj</span>
</div>
<br />
 <form name="form1" method="post" action="">

<textarea rows="3" cols="40" name="user_text" style="border:2 solid #808080; font-family:verdana,arial,helvetica; font-weight:normal; font-size:10pt" onclick="select_area()"></textarea>
<br />
<input type="button" value="Submit" onclick="return validate_user_text();"></form>

Dziękuję Ci