Cannot read properties of undefined (reading 'match') happens when an inline SVG includes <a>

[sapphi-red]

Describe the bug

When an inline SVG includes <a>, the following error happens.

Uncaught TypeError: Cannot read properties of undefined (reading 'match')
    at app.2726314c.js:7:46422
    at NodeList.forEach (<anonymous>)
    at app.2726314c.js:7:46366

The error seems to be happening on this line.

vitepress/src/client/app/composables/preFetch.ts

Line 78 in 0048e2b

const extMatch = pathname.match(/\.\w+$/)

Reproduction

https://stackblitz.com/edit/vite-wmvpvc?file=docs%2Findex.md

Expected behavior

No error happens.

System Info

System:
    OS: Linux 5.0 undefined
    CPU: (8) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
    Memory: 0 Bytes / 0 Bytes
    Shell: 1.0 - /bin/jsh
  Binaries:
    Node: 16.14.2 - /usr/local/bin/node
    Yarn: 1.22.19 - /usr/local/bin/yarn
    npm: 7.17.0 - /usr/local/bin/npm
  npmPackages:
    vitepress: latest => 1.0.0-alpha.40

Additional context

A real world reproduction: https://rollupjs.org/plugin-development/

I guess this bug doesn't affect any functionality other than prefetching.

Validations

• Follow our Code of Conduct
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.