@Override
        public boolean handles(String target) {
          // we assume that every include that starts with `../` is happening inside a listing or literal block
          // and is pointing to a committed file in our repository, so we do the include logic in this processor
          // to get hold of the included filename for generating a link and eventually a play button
          return target.startsWith("../");
        }
The pattern for matching a tagged line in the included file.
This is adapted from the original Ruby regex in Asciidoctor.

@see <a href ="https://github.com/asciidoctor/asciidoctor/blob/4dec7ad055b30a5fe983d44019f9e5531a88d43a/lib/asciidoctor/rx.rb#L108">lib/asciidoctor/rx.rb</a>
build-logic/asciidoc-extensions/src/main/java/org/spockframework/plugins/asciidoctor/IncludedSourceLinker.java