git log --grep does not work in windows - windows

Question

Is there any equivalent for "git log --grep="STRING" in windows?
I've written a python program for linux which requires a reading of commit logs that contain certain string from the git object. This worked fine in linux, but when I ran the same program in windows, git log --grep="STRING" catches nothing.
Here's the code snippet. (fetcher.py)
import os
...
os.chdir(DIRECTORY) # where git obj is
command = "git log --all --grep='KEYWORD' > log.txt"
os.system(command) # run the command in the shell
...
It seems that git internally uses the linux grep for the "--grep" argument such that Windows cannot run this correctly as it misses grep.
Thanks for your help.
As I am not getting any answer for 24 hrs,
I suggest my own solution, which does not utilize grep.
Because git log itself runs without any problem,
I just ran the command without the --grep='STRING' option, then read the output from the shell (or a file) to filter the commit logs which contain 'STRING' by the use of regular expression.
import os
import re
command = "git log --all > log.txt"
os.system(command) # run the command in the shell and store output in log.txt
with open('log.txt', 'r') as fp:
gitlogoutput = fp.readlines() # read the redirected output
if gitlogoutput:
commits = re.split('[\n](?=commit\s\w{40}\nAuthor:\s)', gitlogoutput)
# it splits the output string into each commits
# at every '\n' which is followed by the string 'commit shahash(40bytes)\nAuthor: '
for commit it commits:
if 'KEYWORD' is in commit:
print commit
The approach requires you to add some code, but I believe it does the same thing as the original command does. For better results, you can change the last if statement which is,
if 'KEYWORD' is in commit:
into something that can do more sophisticated search e.g. re.search() method.
In my case, this produced exactly the same result as that of --grep="KEYWORD"
Still, I appreciate your help :)

Answer 1

It seems that git internally uses the linux grep for the "--grep" argument such that Windows cannot run this correctly as it misses grep.
It certainly can, provided your %PATH% includes <git>/usr/bin (which has 200+ Linux commands compiled for Windows)
See this simplified path:
set G=c:\path\to\latest\git
set PATH=%G%\bin;%G%\usr\bin;%G%\mingw64\bin
set PATH=%PATH%;C:\windows\system32;C:\windows\System32\Wbem;C:\windows\System32\WindowsPowerShell\v1.0\
Add the PATH for python, and you can "Linux grep" without any issue.

Answer 2

In Windows, use the following format (replacing the = sign with a space):
git log --grep "STRING"