newsticker-auto-mark-filter-list

newsticker-auto-mark-filter-list is a variable defined in `newst-backend.el'.
Its value is

nil

Documentation:
A list of filters for automatically marking headlines.

This is an alist of the form (FEED-NAME PATTERN-LIST). I.e. each
element consists of a FEED-NAME a PATTERN-LIST. Each element of
the pattern-list has the form (AGE TITLE-OR-DESCRIPTION REGEXP).
AGE must be one of the symbols 'old or 'immortal.
TITLE-OR-DESCRIPTION must be on of the symbols 'title,
'description, or 'all. REGEXP is a regular expression, i.e. a
string.

This filter is checked after a new headline has been retrieved.
If FEED-NAME matches the name of the corresponding news feed, the
pattern-list is checked: The new headline will be marked as AGE
if REGEXP matches the headline's TITLE-OR-DESCRIPTION.

If, for example, `newsticker-auto-mark-filter-list' looks like
((slashdot ('old 'title "^Forget me!$") ('immortal 'title "Read me")
('immortal 'all "important"))))

then all articles from slashdot are marked as old if they have
the title "Forget me!". All articles with a title containing
the string "Read me" are marked as immortal. All articles which
contain the string "important" in their title or their
description are marked as immortal.

You can customize this variable.