Subject: Re: [PATCH v7 2/4] worktree add: refactor opt exclusion tests

From: Junio C Hamano <[email-masked]>
Date: Sun, 08 Jan 2023 16:13:46 +0900

Jacob Abel <[email-masked]> writes:

> +test_wt_add_excl () {
> +	local opts="$*" &&
> +	test_expect_success "'worktree add' with '$opts' has mutually exclusive options" '
> +		test_must_fail git worktree add $opts 2>actual &&
> +		grep -P "fatal:( options)? .* cannot be used together" actual
> +	'
> +}

Of course, "grep -P" is non-portable and CI jobs are easily broken.
Isn't -E (ERE) sufficient here?