[exim] extract in string expansion

Hello everyone,

I'd like to use extract with keys, as it makes for more readable config
than extract with number/string separator. Sadly, I have trouble to get
former to work with double quotes:

da7 (87.204.147.157) ~ % exim -be
> ${extract{result}{result=clean reason=spamtrap}}
clean

> ${extract{result}{result=clean reason="abc def"}
Failed: missing or misplaced { or }

> ${extract{result}{result=clean reason=\"abc def\"}
Failed: missing or misplaced { or }



extract with string separator works OK:

> ${extract{2}{;}{abc;def ghi;jkl mno}}
def ghi


..but that's not what I need here.


Regards,
Marcin Krol