I have a number of javascript variables on my page:

```
var opts_???? = ...
var opts_???? = ...
var opts_???? = ...

```

The `????` is assigned a random number by the content management system, so I don't know the full name of the variable.

I'm looking for any undefined ones.

Is there a way in jQuery to loop through all variables that start with `opts_` so that I can test them for being undefined?

The variables are all global, if that helps.

If not in jQuery, I'll settle for regular javascript.