Hugo alert heading is case-sensitive and upper case only ([!NOTE]), but GitHub Alert Markdown extension is case-insensitive ([!note])

[KoolTechTricks]

What version of Hugo are you using (hugo version)?

$ hugo version
hugo v0.132.1+extended linux/amd64 BuildDate=unknown

Does this issue reproduce with the latest release?

Yes

---

Alerts are introduced in Hugo v0.132.0. Documentation says that syntax is compatible with GitHub Alert Markdown extension. However, GitHub allows writing alert heading in lower case, while Hugo doesn't.

> [!note]
> Example

Note

Example

Hugo won't render [!note], or [!Note], or [!nOtE] as alert while GitHub will.

Probably need to change this regex filter:

hugo/markup/goldmark/blockquotes/blockquotes.go

Line 238 in 665ac94

var gitHubAlertRe = regexp.MustCompile(`^<p>\[!(NOTE|TIP|WARNING|IMPORTANT|CAUTION)\]`)

[bep]

Hugo won't render [!note], or [!Note], or [!nOtE] as alert while GitHub will.

Well, one could argue that the bug lives in GitHub's implementation, because their spec says nothing about casing, but their examples all indicate ... upper case:

https://docs.github.com/en/get-started/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax#alerts

... but I guess we can adjust our regexp ...

Note

Hmm ...

[github-actions]

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