Lucene.Net.Search.TestWildcard.TestEscapes C# (CSharp) Method

        public virtual void TestEscapes()
        {
            Directory indexStore = GetIndexStore("field", new string[] { "foo*bar", "foo??bar", "fooCDbar", "fooSOMETHINGbar", "foo\\" });
            IndexReader reader = DirectoryReader.Open(indexStore);
            IndexSearcher searcher = NewSearcher(reader);

            // without escape: matches foo??bar, fooCDbar, foo*bar, and fooSOMETHINGbar
            WildcardQuery unescaped = new WildcardQuery(new Term("field", "foo*bar"));
            AssertMatches(searcher, unescaped, 4);

            // with escape: only matches foo*bar
            WildcardQuery escaped = new WildcardQuery(new Term("field", "foo\\*bar"));
            AssertMatches(searcher, escaped, 1);

            // without escape: matches foo??bar and fooCDbar
            unescaped = new WildcardQuery(new Term("field", "foo??bar"));
            AssertMatches(searcher, unescaped, 2);

            // with escape: matches foo??bar only
            escaped = new WildcardQuery(new Term("field", "foo\\?\\?bar"));
            AssertMatches(searcher, escaped, 1);

            // check escaping at end: lenient parse yields "foo\"
            WildcardQuery atEnd = new WildcardQuery(new Term("field", "foo\\"));
            AssertMatches(searcher, atEnd, 1);

            reader.Dispose();
            indexStore.Dispose();
        }