Extracting Text Using String Parser?

Hi. I'm having trouble finding out how to extract a set of numbers scattered within a string. Here's some unnecessary context information: ;)

I have a very long string (roughly 70,000 characters) that my application retrieves from an html page which contains about 20 image thumbnails, and each has an image id in their link. I am trying to build a list in MMF2 of these image ids from the html code using the string parser.

BOTTOM LINE:
I need to extract the numbers from the string that lie between "i=" and "><img" into a list object. Can this be done with the string parser? :confused:

Thanks! :D