get elements by class name wildcard
var elements = document.getElementsByClassName( /* class names other than aid_* ones */ var re = new RegExp('(^|\\s)aid_(\\s|$)'); var result = []; for (var i=0, iLen=elements.length; i<iLen; i++) { if (re.test(elements[i].className)) { result.push(elements[i]); } }
Source: stackoverflow.com