问lucene中的Regexpquery不起作用

EN

public IndexWriter generateIndex(String docsPath) throws IOException {

      String indexPath = System.getProperty("java.io.tmpdir") +File.separator+"indexDirectory";
        if (indexPath == null) {
          throw new IOException("System property 'java.io.tmpdir' does not specify a tmp dir");
        }
        File tmpDir = new File(indexPath);
        if (!tmpDir.exists()) {
          boolean created = tmpDir.mkdirs();
          if (!created) {
            throw new IOException("Unable to create tmp dir " + tmpDir);
          }
        }

    boolean create = true;
    final Path docDir = Paths.get(docsPath);
    if (!Files.isReadable(docDir)) {
        System.out.println("Document directory '" + docDir.toAbsolutePath()
                + "' does not exist or is not readable, please check the path");
        System.exit(1);
    }

    Date start = new Date();
    try {
        System.out.println("Indexing to directory '" + indexPath + "'...");

        Directory dir = FSDirectory.open(Paths.get(indexPath));
        Analyzer analyzer = new StandardAnalyzer();
        IndexWriterConfig iwc = new IndexWriterConfig(analyzer);

        if (create) {
            iwc.setOpenMode(OpenMode.CREATE);
        } else {
            iwc.setOpenMode(OpenMode.CREATE_OR_APPEND);
        }

        IndexWriter writer = new IndexWriter(dir, iwc);
        indexDocs(writer, docDir);
        setIndexWriter(writer);

        Date end = new Date();
        System.out.println(end.getTime() - start.getTime() + " total milliseconds");
        writer.close();
    } catch (IOException e) {
        System.out.println(" caught a " + e.getClass() + "\n with message: " + e.getMessage());
    }

    return getIndexWriter();
}

static void indexDocs(final IndexWriter writer, Path path) throws IOException {
    if (Files.isDirectory(path)) {
        Files.walkFileTree(path, new SimpleFileVisitor<Path>() {
            @Override
            public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
                try {
                    indexDoc(writer, file, attrs.lastModifiedTime().toMillis());
                } catch (IOException ignore) {
                    // don't index files that can't be read.
                }
                return FileVisitResult.CONTINUE;
            }
        });
    } else {
        indexDoc(writer, path, Files.getLastModifiedTime(path).toMillis());
    }
}
static void indexDoc(IndexWriter writer, Path file, long lastModified) throws IOException {
    try (InputStream stream = Files.newInputStream(file)) {
        Document doc = new Document();
        Field pathField = new StringField("path", file.toString(), Field.Store.YES);
        doc.add(pathField);

        doc.add(new LongField("modified", lastModified, Field.Store.NO));
        doc.add(new TextField("contents",
                new BufferedReader(new InputStreamReader(stream, StandardCharsets.UTF_8))));

        if (writer.getConfig().getOpenMode() == OpenMode.CREATE) {
            System.out.println("adding " + file);
            writer.addDocument(doc);
        } else {
            System.out.println("updating " + file);
            writer.updateDocument(new Term("path", file.toString()), doc);
        }
    }
}

IndexReader reader = DirectoryReader.open(FSDirectory.open(Paths.get(index)));
    IndexSearcher searcher = new IndexSearcher(reader);
    Analyzer analyzer = new StandardAnalyzer();

    BufferedReader in = null;

    Query query = new RegexpQuery(new Term("contents", "program-id\\."));
    query = query.rewrite(reader);

    System.out.println("Searching for: " + query.toString(field));
    searcher.search(query, null, 100);

QueryParser parser = new QueryParser(field, analyzer);
Query query = parser.parse("+program-id");

IDENTIFICATION DIVISION.
   PROGRAM-ID.  ACINSTAL.

   ENVIRONMENT DIVISION.

   DATA DIVISION.
   WORKING-STORAGE SECTION.