Brew misinterprets # as formulae name

[MatchaOnMuffins]

Output of brew config

HOMEBREW_VERSION: 4.4.31
ORIGIN: https://github.com/Homebrew/brew
HEAD: 0046519c08cd3967e0934c82195361ac7e76c567
Last commit: 7 days ago
Branch: stable
Core tap JSON: 22 Apr 08:21 UTC
Core cask tap JSON: 22 Apr 08:21 UTC
HOMEBREW_PREFIX: /opt/homebrew
HOMEBREW_CASK_OPTS: []
HOMEBREW_MAKE_JOBS: 10
Homebrew Ruby: 3.3.8 => /opt/homebrew/Library/Homebrew/vendor/portable-ruby/3.3.8/bin/ruby
CPU: deca-core 64-bit arm_donan
Clang: 16.0.0 build 1600
Git: 2.39.5 => /Applications/Xcode.app/Contents/Developer/usr/bin/git
Curl: 8.7.1 => /usr/bin/curl
macOS: 15.3-arm64
CLT: 16.3.0.0.1.1742442376
Xcode: 16.2
Rosetta 2: false

Output of brew doctor

Your system is ready to brew.

Description of issue

When running brew install <formulae> # this is a comment, brew outputs the following:

$ brew install awscli # this is a comment
Warning: No available formula with the name "#".
==> Searching for similarly named formulae and casks...
==> Formulae
a2ps
a52dec
...
14k + lines
...
zxpinstaller
zy-player

To install 0-ad, run:
  brew install --cask 0-ad

Brew should ignore # and anything after it.

[gromgit]

Comments are supposed to be removed by the shell, not passed to commands. Sounds like you turned interactive comments off in your bash config. From the bash man page:

In a non-interactive shell, or an interactive shell in which the interactive_comments option to the shopt builtin is enabled (see SHELL BUILTIN COMMANDS below), a word beginning with # causes that word and all remaining characters on that line to be ignored. An interactive shell without the interactive_comments option enabled does not allow comments. The interactive_comments option is on by default in interactive shells.

Not a Homebrew maintainer, but I don't think it's a good idea for Homebrew to ignore users' shell configuration and assume that any instance of # passed to it automatically indicates a comment (which, as I said, would've been stripped by the shell under normal circumstances).