given:
        sampleDoc << """
=== Valid Javadoc Links

Be sure to see: `@link:{javadocPath}/org/gradle/api/tasks/InputDirectory.html[InputDirectory]`

            attributes.put("doctype", "book");
            attributes.put("imagesdir", "img");
            attributes.put("nofooter", true);
            attributes.put("javadocPath", "../javadoc");
            attributes.put("sectanchors", true);
            attributes.put("sectlinks", true);
            attributes.put("linkattrs", true);
            attributes.put("reproducible", "");

    // groovy_plugin.adoc#groovy_plugin,Groovy
    private final Pattern linkWithHashPattern = Pattern.compile("([a-zA-Z_0-9-.]*)#(.*)");
    // link:{javadocPath}/org/gradle/api/java/archives/ManifestMergeDetails.html[ManifestMergeDetails]
    private final Pattern javadocLinkPattern = Pattern.compile("link:\\{javadocPath\\}/(.*?\\.html)");
    // link:../samples/sample_problems_api_usage.html[end-to-end sample]