you could try grabbing everything between the first and last occurrences of a number, but that will run into trouble if there is a number in the string that isn't part of the address...
Code:
<body>
<div class="address">john doe is nice guy btw 8240 E marblehead way 92808 is also</div>
<div class="address">sky being blue? in the world is true? 123 Main St., apt c420 Anywhere, USA 12345 jackfroast nipping on the firehead</div>
<div class="address">I know 1 thing - 456 Second St., Somewhere, USA 16789 was the best place I ever lived</div>
<div id="res"></div>
<script>
var divs=document.getElementsByTagName("div");
for (var i = 0; i < divs.length; i++) {
if(divs[i].className=="address"){
var str=divs[i].innerHTML;
var parsed=str.match(/\d(.*\d)/)[0];
document.getElementById("res").innerHTML+=parsed+"<br>";
}
}
</script>
</body>
