fix: update region marker patterns

[Copilot]

The HTML/XML endregion regex incorrectly matched region instead of endregion, breaking snippet extraction for HTML files. The agent instructions requested syncing the entire region matching algorithm with VitePress.

Changes

• Fixed HTML/XML endregion pattern: Changed /^<!-- #?region[\s\w*-]*-->$/ to /^\s*<!--\s*#?endregion\b\s*(.*?)\s*-->/

• Replaced regionRegexps array with VitePress markers structure:

  • Organized as objects with explicit start/end properties
  • More flexible whitespace matching (\s* vs strict spacing)
  • Added Pascal comment marker support (* *)

• Updated findRegion() with counter-based nesting:

  • Handles same-named nested regions correctly
  • Supports empty region names on end markers as fallback
  • Changed return structure from {start, end, regexp} to {re, start, end}

• Updated region filtering: Now filters using both region.re.start and region.re.end instead of single region.regexp

Example

HTML regions now work correctly:

<!-- #region main -->
<div>Content</div>
<!-- #endregion main -->

Nested regions with same name are properly handled:

// #region test
function outer() {
  // #region test
  function inner() {}
  // #endregion test
}
// #endregion test

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• download.cypress.io
  • Triggering command: node index.js --exec install (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>end region marker for html/xml should be #endregion</issue_title>
<issue_description>
the endregion marker in the regex for html/xml is #region

slidev/packages/slidev/node/syntax/transform/snippet.ts

Line 36 in ba6a004

[/^<!-- #?region ([\w*-]+) -->$/, /^<!-- #?region[\s\w*-]*-->$/],

i think it should be #endregion, at least this is what vscode expects.

</issue_description>

<agent_instructions>Please update the whole region matching algorithm according to the latest https://github.com/vuejs/vitepress/blob/main/src/node/markdown/plugins/snippet.ts. (don't come up with your own!)</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes end region marker for html/xml should be #endregion #2119

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