change inner backslashed quotes

Question

I know the ci" motion and others :changes, but I need something like a ci\" in order to change inner a backslashed quotes. Assuming * as the cursor position:

a = "message says: \"fo*o bar\""

I would like to perform a ci which gives me a:

a = "message says: \"*\""

And then start writing inside the backslashed quotes.

Answer 1

This could be implemented using: https://github.com/kana/vim-textobj-user

Lots of existing plugins are close to this behavior, but none seems to answer the question yet.