javascript - Get All Elements in an HTML document with a specific CSS Class

Question

What's the best way to get an array of all elements in an html document with a specific CSS class using javascript?

No javascript frameworks like jQuery allowed here right now, and I could loop all the elements and check them manually myself. I'm hoping for something a little more elegant.

Answer 1

1) Get all elements in the document (document.getElementsByTagName('*'))
2) Do a regular expression match on the element's className attribute for each element