On Wed, Oct 30, 2019 at 12:58:59PM -0700, Joe Perches wrote:

Instead of duplicating a grep pattern with grep -oh after
git grep like
this:

$ git grep -P '(?:[a-z0-9_]+_)?for_each(?:_[a-z0-9_]+)?' -- '*.[ch]' | \
  grep -P -oh '(?:[a-z0-9_]+_)?for_each(?:_[a-z0-9_]+)?'

it could be useful to have git grep have the same '-o' option 
as gnu grep.

Doesn't it already?

  $ git grep -P -oh '(?:[a-z0-9_]+_)?for_each(?:_[a-z0-9_]+)?'
  for_each
  for_each
  for_each_abbrev
  for_each_builtin
  for_each_string_list_item
  for_each_ut
  [etc...]

It was new in Git v2.19.

-Peff