RegEx matching in Javascript?

[Jaxel]

Lets say I have some code....

<img src="dir/cas.jpg"><img src="dir/ast.jpg">

I want to match this string to an array, using the values in the above code to the variable $matches to return the following:

matches[0] = cas
matches[1] = ast

Then I want to put all the results into a single string:

output = cas,ast

How would I do this? I know how to match in PHP, but Javascript is different.

--------------- Added [DATE]1248292603[/DATE] at [TIME]1248292603[/TIME] ---------------

revised my requirements...

--------------- Added [DATE]1248315264[/DATE] at [TIME]1248315264[/TIME] ---------------

So no one has any ideas for me?

This is the last thing I need for an AJAX script I am working on.