t / t1509 / excludeson commit log --grep: use the same helper to set -E/-F options as "git grep" (34a4ae5)
   1*.o
   2*~
   3*.bak
   4*.c
   5*.h
   6.git
   7contrib
   8Documentation
   9git-gui
  10gitk-git
  11gitweb
  12t/t4013
  13t/t5100
  14t/t5515