How to 'send' this data?

gistfile1.txt

Given this string {{images["220"]["x20"]["grayscale"]["something else"]}}

Using regex, how can I extract the following args?
1. 220
2. x20
3. grayscale
4. something else

But allow for unlimited args. For ex, given this regex {{images["220"]["x20"]["grayscale"]["something else"]["yet another thing"]}}
it'll get these args:
1. 220
2. x20
3. grayscale
4. something else
5. yet another thing

This is my sorry attempt: http://rubular.com/r/jYJjRSVX9K