Some minor issues

[SoftwareApe]

Regex string constant missing r-prefix:

git-format-staged/git-format-staged

Line 80 in 74d0156

file_path_placeholder = re.compile('\{\}')

git-format-staged/git-format-staged

Line 146 in 74d0156

diff_pat = re.compile('^:(\d+) (\d+) ([a-f0-9]+) ([a-f0-9]+) ([A-Z])(\d+)?\t([^\t]+)(?:\t([^\t]+))?$')

Unused variable err could be replaced with _:

git-format-staged/git-format-staged

Line 110 in 74d0156

new_hash, err = write_object.communicate()