Iterable<String> letters = Splitter.on(Pattern.compile(", ")).split(longDelimiter);
    assertThat(letters).containsExactly("", "a", "b", "c").inOrder();
  }

  @GwtIncompatible // java.util.regex.Pattern
  public void testPatternSplitWithLongTrailingDelimiter() {
    String longDelimiter = "a, b, c/ ";
    Iterable<String> letters = Splitter.on(Pattern.compile("[,/]\\s")).split(longDelimiter);

                .getTotalHits()
                .value() > 0);

        // Verify pattern can be retrieved
        final List<Pattern> patterns = urlFilterService.getIncludeUrlPatternList(sessionId);
        assertEquals(1, patterns.size());
        assertTrue(patterns.get(0).matcher("http://example.com/page1").matches());
        assertFalse(patterns.get(0).matcher("http://other.com/page1").matches());

        Pattern pattern = Pattern.compile(FS_FILE_RULE_PATTERN);
        assertTrue(pattern.matcher("text/html").matches());
    }

    @Test
    public void test_fsFileRulePattern_lhaTypes() {
        Pattern pattern = Pattern.compile(FS_FILE_RULE_PATTERN);
        assertTrue(pattern.matcher("application/lha").matches());
        assertTrue(pattern.matcher("application/x-lha").matches());

        LabelTypePattern pattern = new LabelTypePattern("test", "/test.*", "/exclude.*");

        // Should match included path
        assertTrue(pattern.match("/test/path"));

        // Should not match excluded path
        assertFalse(pattern.match("/exclude/path"));

        // Should not match non-included path
        assertFalse(pattern.match("/other/path"));
    }

    @Test

crawler.document.html.default.lang=
# Patterns to include for HTML index processing.
crawler.document.html.default.include.index.patterns=
# Patterns to exclude for HTML index processing.
crawler.document.html.default.exclude.index.patterns=(?i).*(css|js|jpeg|jpg|gif|png|bmp|wmv|xml|ico|exe)
# Patterns to include for HTML search processing.
crawler.document.html.default.include.search.patterns=
# Patterns to exclude for HTML search processing.

mvn verify                            # Generate coverage report
```

## Code Conventions

### Class Structure

- **Utility classes**: `abstract` class + `protected` constructor
- **Constants classes**: Same pattern

### Argument Validation

Use `AssertionUtil` at method entry:
- `AssertionUtil.assertArgumentNotNull("argName", value)`
- `AssertionUtil.assertArgumentNotEmpty("argName", value)`

### Exception Handling

        assertFalse(validator.isValid("* * * *", context));
    }

    // Test common valid cron patterns that are likely to work
    @Test
    public void test_basicValidCronExpressions() {
        final ConstraintValidatorContext context = null;

        // Test basic patterns that should be valid
        String[] potentiallyValidCrons = { "0 0 * * * ?", // Every hour

        // Add array first
        String[] initialArray = new String[] { "a", "b", "c" };
        transformer.putResultDataBody(dataMap, "letters", initialArray);

        // Add single value
        transformer.putResultDataBody(dataMap, "letters", "d");

        Object result = dataMap.get("letters");
        assertTrue(result instanceof Object[]);
        Object[] resultArray = (Object[]) result;

    /** Pattern for detecting reserved characters in Lucene range field queries. */
    public static final Pattern LUCENE_RANGE_FIELD_RESERVED_PATTERN = Pattern.compile("([!\\(\\){}\\[\\]\"~\\\\:\\p{Zs}]|(&&)|(\\|\\|))");

    // ============================================================
    // Query and Search Constants

          // Canonical escaper method that only escapes lower case ASCII letters.
          @Override
          protected char @Nullable [] escape(int cp) {
            return ('a' <= cp && cp <= 'z') ? new char[] {Character.toUpperCase((char) cp)} : null;
          }

          // Inefficient implementation that defines all letters as escapable.
          @Override