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grep solution

grep '^=.*rst' *.adoc 

where

• ^ begin of line
• = equal
• .* anything any number of time
• rst string rst (you were looking for fifth ? )

this will list files and found line

first.adoc:= The title of the first file 

to only files use -l ( or --file-with-matches)

grep -l '^=.*rst' *.adoc 

to only list lines and not the filename use -h (or --no-filename)

see man grep