fix(exturl): Return encrypted URL with title.

[ghost]

PR Checklist

• The commit message follows guidelines for NexT.
• Tests for the changes was maked (for bug fixes / features).
  • Muse | Mist have been tested.
  • Pisces | Gemini have been tested.
• Docs in NexT website have been added / updated (for features).

PR Type

• Bugfix.
• Feature.
• Code style update (formatting, local variables).
• Refactoring (no functional changes, no api changes).
• Documentation.
• Translation.
• Other... Please describe:

What is the current behavior?

Issue resolved: #4 (comment)

What is the new behavior?

Use regular expressions to extract the title

// Return encrypted URL with title.
const title = match.match(/title="([^"]+)"/);
if (title) return `<span class="exturl" data-url="${Buffer.from(href).toString('base64')}" title="${title[1]}">${html}<i class="fa fa-external-link-alt"></i></span>`;

How to test?

In Markdown

[acme.sh][acmesh]
[acmesh]: https://github.com/acmesh-official/acme.sh "An ACME Shell script: acme.sh"

Output:

<span class="exturl" data-url="aHR0cHM6Ly9naXRodWIuY29tL2FjbWVzaC1vZmZpY2lhbC9hY21lLnNo" title="An ACME Shell script: acme.sh">acme.sh<i class="fa fa-external-link-alt"></i></span>