Hexo, on which this blog is based, is a Static Site Generator (SSG) that generates a whole structure of HTML files from individual Markdown files in which the articles were written. Besides the actual posts, also overview pages like the archives and others. For the latter, however, it only needs an excerpt from the actual article, which Hexo automatically creates from the initially generated HTML content and which is also available as HTML.
For my Page Meta dialog, however, I recently needed the excerpt as plain text to make it easier to transfer it manually to a Mastodon post, for example. My initial attempts to extract the plain text from the original Markdown turned out to be quite difficult, because in Hexo not only Markdown is used, but also special Tag Plugins in Nunjucks format and of course plain HTML. Long speech, short sense … after the first dozen RegEx-Replace calls, I got doubts to be on the right way and remembered
Page.Excerpt, the variant already generated by Hexo in HTML.