<script type="text/javascript">

var regex = "/<(.|\n)*?>/";
var body = "<p>test</p>";
var result = body.replace(regex,"");
alert(result);

</script>

var regex = /(<([^>]+)>)/ig,body = "<p>test</p>",result = body.replace(regex,"");

console.log(result);

console.log($('<p>test</p>').text());