(no subject)

Thank you for filling out a Git bug report! Please answer the following questions to help us understand your issue.

What did you do before the bug happened? (Steps to reproduce your issue)

I ran:
  $ git grep -rl --color=never '#!/.*/env ruby'

What did you expect to happen? (Expected behavior)

Get a list of filenames where the contents matched the regex

What happened instead? (Actual behavior)

For one of my files named `ensure-string-env.rb` was printed with part of the path in colour, and the first dash of the filename replaced with a colon.

What's different between what you expected and what actually happened?

I expected:
  images/deploy_tools/scripts/ensure-string-env.rb

I got:
  images/deploy_tools/scripts/ensure:string-env.rb

  The string up to the colon was printed in pink

Anything else you want to add:

I tested with both zsh and bash with the same result. I teested with git 2.47.3 and 2.49.1 everything worked correctly. I also tried other terminals to rule that out.

2.51.1 is the current version on Fedora 42

I was able to reproduce this with:
  $ echo foo > test-one
  $ git add test-one
  $ git grep -l foo
  test:one

This seems to be reproducible with any filename containing a dash

[System Info]
git version:
git version 2.51.1
cpu: x86_64
no commit associated with this build
sizeof-long: 8
sizeof-size_t: 8
shell-path: /bin/sh
libcurl: 8.11.1
OpenSSL: OpenSSL 3.2.6 30 Sep 2025
zlib-ng: 2.2.5
SHA-1: SHA1_DC
SHA-256: SHA256_BLK
default-ref-format: files
default-hash: sha1
uname: Linux 6.17.5-200.fc42.x86_64 #1 SMP PREEMPT_DYNAMIC Fri Oct 24 14:10:01 UTC 2025 x86_64
compiler info: gnuc: 15.2
libc info: glibc: 2.41
$SHELL (typically, interactive shell): /bin/zsh

[Enabled Hooks] pre-commit