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6.4 Tag searches

Once a system of tags has been set up, it can be used to collect related information into special lists.

C-c \
C-c / m
Create a sparse tree with all headlines matching a tags search. With a C-u prefix argument, ignore headlines that are not a TODO line.
C-c a m
Create a global list of tag matches from all agenda files. See Matching tags and properties.
C-c a M
Create a global list of tag matches from all agenda files, but check only TODO items and force checking subitems (see variable org-tags-match-list-sublevels).

These commands all prompt for a match string which allows basic Boolean logic like ‘+boss+urgent-project1’, to find entries with tags ‘boss’ and ‘urgent’, but not ‘project1’, or ‘Kathy|Sally’ to find entries which are tagged, like ‘Kathy’ or ‘Sally’. The full syntax of the search string is rich and allows also matching against TODO keywords, entry levels and properties. For a complete description with many examples, see Matching tags and properties.

Further reading
Chapter 6 of the manual
Sacha Chua's article about tagging in Org-mode