Need help with font-lock

[Osor77]

Hi All,

I've recently started to use emacs to write C code and I'm pretty happy
about it.
There is one thing that I haven't been able to figure out, that is how to
highlight format strings and escape characters.
I've found a solution, but it highlighted the whole string, not just the
format characters and the escapes. vi does it by default and it's the only
thing I really miss from coding using vi.
As an example, given

printf ("Your number is %4d\n", number)

I would like emacs, apart from the rest of the syntax highlighting, to
highlight "%d4\n" and ONLY that, in a different colour.
I'm not very fluent in lisp, so I'd greatly appreciate any help.

Thanks
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