[Bug]: toMatchAriaSnapshot cannot parse the snapshot that ariaSnapshot() produces for names starting and ending with "/" #42807

Version

1.64.0-next (main @ 07f1a61); reproduces on 1.63 as well

Steps to reproduce

import { test, expect } from '@playwright/test';

test('aria snapshot round-trip', async ({ page }) => {
  await page.setContent(`<nav><a href="/">/</a></nav>`);
  const snapshot = await page.locator('nav').ariaSnapshot();
  console.log(JSON.stringify(snapshot));
  await expect(page.locator('nav')).toMatchAriaSnapshot(snapshot);
});

Same thing happens with expect(locator).toMatchAriaSnapshot({ name: 'x.aria.yml' }) on the second run, or after --update-snapshots: the file Playwright writes on the first run fails to parse on the next run.

Expected behavior

The snapshot is rendered with the name quoted (- link "/":) and matches on the next run.

Actual behavior

"- navigation:\n  - link /:\n    - /url: /"

Error: expect(locator).toMatchAriaSnapshot(expected) failed
Error: Unterminated regex:

link /
      ^

Other names that start and end with / behave the same: /api/v1/ gives Unexpected input, /[a/ gives Unterminated regex. A name like /docs/ parses, but silently becomes the regex /docs/, so it also matches unrelated names such as xdocsx.

Additional context

packages/isomorphic/ariaSnapshotRenderer.ts (createKey) skips JSON.stringify for any name that starts and ends with /, assuming it is a regex produced by convertToBestGuessRegex. That heuristic runs even when convertStringsToRegex is off (locator.ariaSnapshot(), snapshot files, "Expected/Received" in failure messages, codegen), so a literal name such as / is emitted unquoted and the key parser treats it as a regex.

Root-style links (<a href="/">/</a>) are common in breadcrumbs, path navigation and file/route tables.

I intend to work on this and will send a PR.

Environment

- Operating System: macOS (Darwin 25.6.0)
- Node.js: 24.8.0
- Browser: Chromium (bundled r1246)
- Playwright: main @ 07f1a6154