public void testRegexpExtractor() {

    Set<Term> expected = new HashSet<>(Arrays.asList(
        new Term("field", "califragilisticXX"),
        new Term("field", "WILDCARD")));
    assertEquals(expected, collectTerms(new RegexpQuery(new Term("field", "super.*califragilistic"))));

    expected = new HashSet<>(Arrays.asList(
        new Term("field", "hellXX"),
        new Term("field", "WILDCARD")));
    assertEquals(expected, collectTerms(new RegexpQuery(new Term("field", "hell."))));

    expected = new HashSet<>(Arrays.asList(
        new Term("field", "heXX"),
        new Term("field", "WILDCARD")));
    assertEquals(expected, collectTerms(new RegexpQuery(new Term("field", "hel?o"))));

  }
 

@Override
public RegexpQuery build(QueryNode queryNode) throws QueryNodeException {
  RegexpQueryNode regexpNode = (RegexpQueryNode) queryNode;

  // TODO: make the maxStates configurable w/ a reasonable default (QueryParserBase uses 10000)
  RegexpQuery q = new RegexpQuery(new Term(regexpNode.getFieldAsString(),
      regexpNode.textToBytesRef()));

  MultiTermQuery.RewriteMethod method = (MultiTermQuery.RewriteMethod) queryNode
      .getTag(MultiTermRewriteMethodProcessor.TAG_ID);
  if (method != null) {
    q.setRewriteMethod(method);
  }

  return q;
}
 

public void testNoSuchMultiTermsInSpanFirst() throws Exception {
  //this hasn't been a problem  
  FuzzyQuery fuzzyNoSuch = new FuzzyQuery(new Term("field", "noSuch"), 1, 0, 1, false);
  SpanQuery spanNoSuch = new SpanMultiTermQueryWrapper<>(fuzzyNoSuch);
  SpanQuery spanFirst = new SpanFirstQuery(spanNoSuch, 10);
 
  assertEquals(0, searcher.count(spanFirst));
  
  WildcardQuery wcNoSuch = new WildcardQuery(new Term("field", "noSuch*"));
  SpanQuery spanWCNoSuch = new SpanMultiTermQueryWrapper<>(wcNoSuch);
  spanFirst = new SpanFirstQuery(spanWCNoSuch, 10);
  assertEquals(0, searcher.count(spanFirst));

  RegexpQuery rgxNoSuch = new RegexpQuery(new Term("field", "noSuch"));
  SpanQuery spanRgxNoSuch = new SpanMultiTermQueryWrapper<>(rgxNoSuch);
  spanFirst = new SpanFirstQuery(spanRgxNoSuch, 10);
  assertEquals(0, searcher.count(spanFirst));
  
  PrefixQuery prfxNoSuch = new PrefixQuery(new Term("field", "noSuch"));
  SpanQuery spanPrfxNoSuch = new SpanMultiTermQueryWrapper<>(prfxNoSuch);
  spanFirst = new SpanFirstQuery(spanPrfxNoSuch, 10);
  assertEquals(0, searcher.count(spanFirst));
}
 

/**
 * Instantiates a new mtas span regexp query.
 *
 * @param term the term
 * @param singlePosition the single position
 */
public MtasSpanRegexpQuery(Term term, boolean singlePosition) {
  super(singlePosition ? 1 : null, singlePosition ? 1 : null);
  RegexpQuery req = new RegexpQuery(term);
  query = new SpanMultiTermQueryWrapper<>(req);
  this.term = term;
  this.singlePosition = singlePosition;
  int i = term.text().indexOf(MtasToken.DELIMITER);
  if (i >= 0) {
    prefix = term.text().substring(0, i);
    value = term.text().substring((i + MtasToken.DELIMITER.length()));
    value = (value.length() > 0) ? value : null;
  } else {
    prefix = term.text();
    value = null;
  }
}
 

@Test
public void testRegexpQuery() throws Exception {
    // 正则查询
    RegexpQuery query = new RegexpQuery(new Term("title", "To[a-z]"));
    TopDocs search = searcher.search(query, 1000);
    Assert.assertEquals(7, search.totalHits.value);
}
 

public void testOneRegexp() throws Exception {
  RandomIndexWriter iw = new RandomIndexWriter(random(), dir, indexAnalyzer);

  Field body = new Field("body", "", fieldType);
  Document doc = new Document();
  doc.add(body);

  body.setStringValue("This is a test.");
  iw.addDocument(doc);
  body.setStringValue("Test a one sentence document.");
  iw.addDocument(doc);

  IndexReader ir = iw.getReader();
  iw.close();

  IndexSearcher searcher = newSearcher(ir);
  UnifiedHighlighter highlighter = randomUnifiedHighlighter(searcher, indexAnalyzer);
  Query query = new RegexpQuery(new Term("body", "te.*"));
  TopDocs topDocs = searcher.search(query, 10, Sort.INDEXORDER);
  assertEquals(2, topDocs.totalHits.value);
  String snippets[] = highlighter.highlight("body", query, topDocs);
  assertEquals(2, snippets.length);
  assertEquals("This is a <b>test</b>.", snippets[0]);
  assertEquals("<b>Test</b> a one sentence document.", snippets[1]);

  // wrong field
  highlighter.setFieldMatcher(null);//default
  BooleanQuery bq = new BooleanQuery.Builder()
      .add(new MatchAllDocsQuery(), BooleanClause.Occur.SHOULD)
      .add(new RegexpQuery(new Term("bogus", "te.*")), BooleanClause.Occur.SHOULD)
      .build();
  topDocs = searcher.search(bq, 10, Sort.INDEXORDER);
  assertEquals(2, topDocs.totalHits.value);
  snippets = highlighter.highlight("body", bq, topDocs);
  assertEquals(2, snippets.length);
  assertEquals("This is a test.", snippets[0]);
  assertEquals("Test a one sentence document.", snippets[1]);

  ir.close();
}
 

public void testNullPointerException() throws IOException {
  RegexpQuery regex = new RegexpQuery(new Term("field", "worl."));
  SpanQuery wrappedquery = new SpanMultiTermQueryWrapper<>(regex);
      
  MemoryIndex mindex = randomMemoryIndex();
  mindex.addField("field", new MockAnalyzer(random()).tokenStream("field", "hello there"));

  // This throws an NPE
  assertEquals(0, mindex.search(wrappedquery), 0.00001f);
  TestUtil.checkReader(mindex.createSearcher().getIndexReader());
}
 

public void testPassesIfWrapped() throws IOException {
  RegexpQuery regex = new RegexpQuery(new Term("field", "worl."));
  SpanQuery wrappedquery = new SpanOrQuery(new SpanMultiTermQueryWrapper<>(regex));

  MemoryIndex mindex = randomMemoryIndex();
  mindex.addField("field", new MockAnalyzer(random()).tokenStream("field", "hello there"));

  // This passes though
  assertEquals(0, mindex.search(wrappedquery), 0.00001f);
  TestUtil.checkReader(mindex.createSearcher().getIndexReader());
}
 

@Override
public QueryTree handleQuery(Query q, TermWeightor termWeightor) {
  if (q instanceof RegexpQuery == false) {
    return null;
  }
  RegexpQuery query = (RegexpQuery) q;
  String regexp = parseOutRegexp(query.toString(""));
  String selected = selectLongestSubstring(regexp);
  Term term = new Term(query.getField(), selected + ngramSuffix);
  double weight = termWeightor.applyAsDouble(term);
  return new QueryTree() {
    @Override
    public double weight() {
      return weight;
    }

    @Override
    public void collectTerms(BiConsumer<String, BytesRef> termCollector) {
      termCollector.accept(term.field(), term.bytes());
      termCollector.accept(term.field(), wildcardTokenBytes);
    }

    @Override
    public boolean advancePhase(double minWeight) {
      return false;
    }

    @Override
    public String toString(int depth) {
      return space(depth) + "WILDCARD_NGRAM[" + term.toString() + "]^" + weight;
    }
  };
}
 

public void testOrderedNearWithWildcardExtractor() {
  SpanNearQuery q = new SpanNearQuery(new SpanQuery[]{
      new SpanMultiTermQueryWrapper<>(new RegexpQuery(new Term("field", "super.*cali.*"))),
      new SpanTermQuery(new Term("field", "is"))
  }, 0, true);

  Set<Term> expected = Collections.singleton(new Term("field", "is"));
  assertEquals(expected, collectTerms(q));
}
 

public void testWildcards() throws IOException {

    try (Monitor monitor = newMonitor()) {

      monitor.register(new MonitorQuery("1", new RegexpQuery(new Term(FIELD, "he.*"))));

      MatchingQueries<HighlightsMatch> matches = monitor.match(buildDoc("hello world"), HighlightsMatch.MATCHER);
      assertEquals(1, matches.getQueriesRun());
      assertEquals(1, matches.getMatchCount());
      assertEquals(1, matches.matches("1").getHitCount());
    }
  }
 

public void testSimpleRegex() throws ParseException {
  String[] fields = new String[] {"a", "b"};
  MultiFieldQueryParser mfqp = new MultiFieldQueryParser(fields, new MockAnalyzer(random()));

  BooleanQuery.Builder bq = new BooleanQuery.Builder();
  bq.add(new RegexpQuery(new Term("a", "[a-z][123]")), Occur.SHOULD);
  bq.add(new RegexpQuery(new Term("b", "[a-z][123]")), Occur.SHOULD);
  assertEquals(bq.build(), mfqp.parse("/[a-z][123]/"));
}
 

public void testNoSuchMultiTermsInNear() throws Exception {
  //test to make sure non existent multiterms aren't throwing null pointer exceptions  
  FuzzyQuery fuzzyNoSuch = new FuzzyQuery(new Term("field", "noSuch"), 1, 0, 1, false);
  SpanQuery spanNoSuch = new SpanMultiTermQueryWrapper<>(fuzzyNoSuch);
  SpanQuery term = new SpanTermQuery(new Term("field", "brown"));
  SpanQuery near = new SpanNearQuery(new SpanQuery[]{term, spanNoSuch}, 1, true);
  assertEquals(0, searcher.count(near));
  //flip order
  near = new SpanNearQuery(new SpanQuery[]{spanNoSuch, term}, 1, true);
  assertEquals(0, searcher.count(near));
  
  WildcardQuery wcNoSuch = new WildcardQuery(new Term("field", "noSuch*"));
  SpanQuery spanWCNoSuch = new SpanMultiTermQueryWrapper<>(wcNoSuch);
  near = new SpanNearQuery(new SpanQuery[]{term, spanWCNoSuch}, 1, true);
  assertEquals(0, searcher.count(near));

  RegexpQuery rgxNoSuch = new RegexpQuery(new Term("field", "noSuch"));
  SpanQuery spanRgxNoSuch = new SpanMultiTermQueryWrapper<>(rgxNoSuch);
  near = new SpanNearQuery(new SpanQuery[]{term, spanRgxNoSuch}, 1, true);
  assertEquals(0, searcher.count(near));
  
  PrefixQuery prfxNoSuch = new PrefixQuery(new Term("field", "noSuch"));
  SpanQuery spanPrfxNoSuch = new SpanMultiTermQueryWrapper<>(prfxNoSuch);
  near = new SpanNearQuery(new SpanQuery[]{term, spanPrfxNoSuch}, 1, true);
  assertEquals(0, searcher.count(near));

  //test single noSuch
  near = new SpanNearQuery(new SpanQuery[]{spanPrfxNoSuch}, 1, true);
  assertEquals(0, searcher.count(near));
  
  //test double noSuch
  near = new SpanNearQuery(new SpanQuery[]{spanPrfxNoSuch, spanPrfxNoSuch}, 1, true);
  assertEquals(0, searcher.count(near));

}
 

public void testNoSuchMultiTermsInNotNear() throws Exception {
  //test to make sure non existent multiterms aren't throwing non-matching field exceptions  
  FuzzyQuery fuzzyNoSuch = new FuzzyQuery(new Term("field", "noSuch"), 1, 0, 1, false);
  SpanQuery spanNoSuch = new SpanMultiTermQueryWrapper<>(fuzzyNoSuch);
  SpanQuery term = new SpanTermQuery(new Term("field", "brown"));
  SpanNotQuery notNear = new SpanNotQuery(term, spanNoSuch, 0,0);
  assertEquals(1, searcher.count(notNear));

  //flip
  notNear = new SpanNotQuery(spanNoSuch, term, 0,0);
  assertEquals(0, searcher.count(notNear));
  
  //both noSuch
  notNear = new SpanNotQuery(spanNoSuch, spanNoSuch, 0,0);
  assertEquals(0, searcher.count(notNear));

  WildcardQuery wcNoSuch = new WildcardQuery(new Term("field", "noSuch*"));
  SpanQuery spanWCNoSuch = new SpanMultiTermQueryWrapper<>(wcNoSuch);
  notNear = new SpanNotQuery(term, spanWCNoSuch, 0,0);
  assertEquals(1, searcher.count(notNear));

  RegexpQuery rgxNoSuch = new RegexpQuery(new Term("field", "noSuch"));
  SpanQuery spanRgxNoSuch = new SpanMultiTermQueryWrapper<>(rgxNoSuch);
  notNear = new SpanNotQuery(term, spanRgxNoSuch, 1, 1);
  assertEquals(1, searcher.count(notNear));
  
  PrefixQuery prfxNoSuch = new PrefixQuery(new Term("field", "noSuch"));
  SpanQuery spanPrfxNoSuch = new SpanMultiTermQueryWrapper<>(prfxNoSuch);
  notNear = new SpanNotQuery(term, spanPrfxNoSuch, 1, 1);
  assertEquals(1, searcher.count(notNear));
  
}
 

public void testNoSuchMultiTermsInOr() throws Exception {
  //test to make sure non existent multiterms aren't throwing null pointer exceptions  
  FuzzyQuery fuzzyNoSuch = new FuzzyQuery(new Term("field", "noSuch"), 1, 0, 1, false);
  SpanQuery spanNoSuch = new SpanMultiTermQueryWrapper<>(fuzzyNoSuch);
  SpanQuery term = new SpanTermQuery(new Term("field", "brown"));
  SpanOrQuery near = new SpanOrQuery(new SpanQuery[]{term, spanNoSuch});
  assertEquals(1, searcher.count(near));
  
  //flip
  near = new SpanOrQuery(new SpanQuery[]{spanNoSuch, term});
  assertEquals(1, searcher.count(near));

  
  WildcardQuery wcNoSuch = new WildcardQuery(new Term("field", "noSuch*"));
  SpanQuery spanWCNoSuch = new SpanMultiTermQueryWrapper<>(wcNoSuch);
  near = new SpanOrQuery(new SpanQuery[]{term, spanWCNoSuch});
  assertEquals(1, searcher.count(near));

  RegexpQuery rgxNoSuch = new RegexpQuery(new Term("field", "noSuch"));
  SpanQuery spanRgxNoSuch = new SpanMultiTermQueryWrapper<>(rgxNoSuch);
  near = new SpanOrQuery(new SpanQuery[]{term, spanRgxNoSuch});
  assertEquals(1, searcher.count(near));
  
  PrefixQuery prfxNoSuch = new PrefixQuery(new Term("field", "noSuch"));
  SpanQuery spanPrfxNoSuch = new SpanMultiTermQueryWrapper<>(prfxNoSuch);
  near = new SpanOrQuery(new SpanQuery[]{term, spanPrfxNoSuch});
  assertEquals(1, searcher.count(near));
  
  near = new SpanOrQuery(new SpanQuery[]{spanPrfxNoSuch});
  assertEquals(0, searcher.count(near));
  
  near = new SpanOrQuery(new SpanQuery[]{spanPrfxNoSuch, spanPrfxNoSuch});
  assertEquals(0, searcher.count(near));

}
 

/**
 * Builds a new RegexpQuery instance
 * @param regexp Regexp term
 * @return new RegexpQuery instance
 */
protected Query newRegexpQuery(Term regexp) {
  RegexpQuery query = new RegexpQuery(regexp);
  SchemaField sf = schema.getField(regexp.field());
  query.setRewriteMethod(sf.getType().getRewriteMethod(parser, sf));
  return query;
}
 

public static void assertEqualsQuery(Query expected, Query actual) {
  assertEquals(expected.getClass(), actual.getClass());
  if (expected instanceof BooleanQuery) {
    assertEqualsBooleanQuery((BooleanQuery) expected, (BooleanQuery) actual);
  } else if (expected instanceof SuperQuery) {
    assertEqualsSuperQuery((SuperQuery) expected, (SuperQuery) actual);
  } else if (expected instanceof TermQuery) {
    assertEqualsTermQuery((TermQuery) expected, (TermQuery) actual);
  } else if (expected instanceof PrefixQuery) {
    assertEqualsPrefixQuery((PrefixQuery) expected, (PrefixQuery) actual);
  } else if (expected instanceof WildcardQuery) {
    assertEqualsWildcardQuery((WildcardQuery) expected, (WildcardQuery) actual);
  } else if (expected instanceof FuzzyQuery) {
    assertEqualsFuzzyQuery((FuzzyQuery) expected, (FuzzyQuery) actual);
  } else if (expected instanceof RegexpQuery) {
    assertEqualsRegexpQuery((RegexpQuery) expected, (RegexpQuery) actual);
  } else if (expected instanceof TermRangeQuery) {
    assertEqualsTermRangeQuery((TermRangeQuery) expected, (TermRangeQuery) actual);
  } else if (expected instanceof MatchAllDocsQuery) {
    assertEqualsMatchAllDocsQuery((MatchAllDocsQuery) expected, (MatchAllDocsQuery) actual);
  } else if (expected instanceof MultiPhraseQuery) {
    assertEqualsMultiPhraseQuery((MultiPhraseQuery) expected, (MultiPhraseQuery) actual);
  } else if (expected instanceof PhraseQuery) {
    assertEqualsPhraseQuery((PhraseQuery) expected, (PhraseQuery) actual);
  } else if (expected instanceof NumericRangeQuery<?>) {
    assertEqualsNumericRangeQuery((NumericRangeQuery<?>) expected, (NumericRangeQuery<?>) actual);
  } else {
    fail("Type [" + expected.getClass() + "] not supported");
  }
}
 

private static Term getTerm(RegexpQuery regexpQuery) {
  try {
    Field field = AutomatonQuery.class.getDeclaredField("term");
    field.setAccessible(true);
    return (Term) field.get(regexpQuery);
  } catch (Exception e) {
    throw new RuntimeException(e);
  }
}
 

@Override
protected Query literalMatchesAnyArrayRef(Literal candidate, Reference array, LuceneQueryBuilder.Context context) throws IOException {
    String regexString = LikeOperators.patternToRegex((String) candidate.value(), LikeOperators.DEFAULT_ESCAPE, false);
    regexString = regexString.substring(1, regexString.length() - 1);
    String notLike = negateWildcard(regexString);

    return new RegexpQuery(new Term(
        array.column().fqn(),
        notLike),
        RegexpFlag.COMPLEMENT.value()
    );
}
 

/**
 * Make sure we still sport the fast Lucene regular
 * expression engine when not using PCRE features.
 */
@Test
public void testRegexQueryFast() throws Exception {
    Query query = convert("name ~ '[a-z]'");
    assertThat(query, instanceOf(ConstantScoreQuery.class));
    ConstantScoreQuery scoreQuery = (ConstantScoreQuery) query;
    assertThat(scoreQuery.getQuery(), instanceOf(RegexpQuery.class));
}
 

public void testRegexpQuery() throws Exception {
  makeIndexStrMV();
  Term term = new Term(F, "d[a-z].g");
  defgMultiTermQueryTest(new RegexpQuery(term));
}
 

public void testSpanMultiTerms() {
  SpanQuery q = new SpanMultiTermQueryWrapper<>(new RegexpQuery(new Term("field", "term.*")));
  Set<Term> terms = collectTerms(q);
  assertEquals(1, terms.size());
  assertEquals(TermFilteredPresearcher.ANYTOKEN_FIELD, terms.iterator().next().field());
}
 

public void testRegexQueryParsing() throws Exception {
  final String[] fields = {"b", "t"};

  final StandardQueryParser parser = new StandardQueryParser();
  parser.setMultiFields(fields);
  parser.setDefaultOperator(StandardQueryConfigHandler.Operator.AND);
  parser.setAnalyzer(new MockAnalyzer(random()));

  BooleanQuery.Builder exp = new BooleanQuery.Builder();
  exp.add(new BooleanClause(new RegexpQuery(new Term("b", "ab.+")), BooleanClause.Occur.SHOULD));//TODO spezification? was "MUST"
  exp.add(new BooleanClause(new RegexpQuery(new Term("t", "ab.+")), BooleanClause.Occur.SHOULD));//TODO spezification? was "MUST"

  assertEquals(exp.build(), parser.parse("/ab.+/", null));

  RegexpQuery regexpQueryexp = new RegexpQuery(new Term("test", "[abc]?[0-9]"));

  assertEquals(regexpQueryexp, parser.parse("test:/[abc]?[0-9]/", null));

}
 

private RegexpQuery rxq(String field, String text) {
  return new RegexpQuery(new Term(field, text));
}
 

private static void assertEqualsRegexpQuery(RegexpQuery expected, RegexpQuery actual) {
  assertEquals(expected.getField(), actual.getField());
  assertEquals(getTerm(expected), getTerm(actual));
}
 

public SearchResult searchRegexp(String string, String fieldName,
        boolean applyAllDeletes, IDocumentsVisitor visitor, String... fieldsToLoad) throws IOException {
    Query query = new RegexpQuery(new Term(fieldName, string));
    return search(query, applyAllDeletes, visitor, fieldsToLoad);
}
 

private static Query toLuceneRegexpQuery(String fieldName, String value) {
    return new ConstantScoreQuery(
        new RegexpQuery(new Term(fieldName, value), RegExp.ALL));
}