DEMO goes first

CODE goes second

<form id="f" name="f" method="post" action="">
	<textarea name="g" cols="100" rows="5">
		<img width="123" height="456" src="/img/at2.png" alt="test">
		<img width="789" height="987" src="http://img.xiaohudie.net/at.png" alt="demo">
	</textarea>
	<input type="button" value="find img url"  onclick="alert(h(d).join('n'));"/>
</form>
<script language="javascript"> 
function  h(d){
   /**
    * Js_regex_img_url  
    * coder: xiaohudie
    * 2013-05-17
    */
    var a=/<img.+?src=('|")?([^'"]+)('|")?(?:s+|>)/gim;
    var b = [];
    while(c=a.exec(d)){
        b.push(c[2]);
    }
    return b;
}
var d= document.f.g.value; 
///alert(e.join('n')); 
</script>

End.