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Denis Dzyubenko <shad@mail.kubtelecom.ru> writes:

> I test my function, it works fine:
> (my-gnus-simplify-talk-ru "Old Subject - fido7.su.c-cpp")
> returns "Old Subject".
>
> But when replying " - fido7.su.c-cpp" is not removed from subjects -
> what I do wrong ?

I think `gnus-simplify-subject-functions' doesn't do what you think
it does.  The option is used for threading, i.e. to decide when two
subjects are considered the same.

`gnus-list-identifiers' is probably what you want.

> btw, is gnus-simplify-* functions documented? I can't find anything
> about these functions in Gnus documentation.

Did you try `i gnus-simplify-subject-functions' in the Gnus manual?