import java.io.Serializable;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/** A regex pattern implementation which is backed by the {@link Pattern}. */
@GwtIncompatible
final class JdkPattern extends CommonPattern implements Serializable {
  private final Pattern pattern;

  JdkPattern(Pattern pattern) {
    this.pattern = Preconditions.checkNotNull(pattern);
  }

  @Override
  public CommonMatcher matcher(CharSequence t) {

        }
    }

    /**
     * Moves the position over the given pattern if currently looking at the pattern. Does nothing if not.
     */
    public void skip(Pattern pattern) {
        Matcher m = pattern.matcher(input);
        m.region(pos, input.length());
        if (m.lookingAt()) {
            pos = m.end();
        }
    }

    public void pushText(String rawCommentText) {

    private static final Pattern ATTRIBUTE_SEPARATOR = Pattern.compile("\\s*=\\s*");
    private static final Pattern END_ELEMENT_NAME = Pattern.compile("\\s+|(/>)|>");
    private static final Pattern END_ELEMENT = Pattern.compile("(/>)|>");
    private static final Pattern HTML_ENCODED_CHAR = Pattern.compile("&#\\d+;");
    private static final Pattern HTML_ENTITY = Pattern.compile("&.+?;");

     */
    public CopyOptions dateConverter(final String pattern, final CharSequence... propertyNames) {
        assertArgumentNotEmpty("pattern", pattern);

        return converter(new DateConverter(pattern), propertyNames);
    }

    /**
     * Sets a converter for SQL dates.
     *
     * @param pattern
     *            The date pattern. Must not be {@literal null} or an empty string.

import java.io.Serializable;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/** A regex pattern implementation which is backed by the {@link Pattern}. */
@GwtIncompatible
final class JdkPattern extends CommonPattern implements Serializable {
  private final Pattern pattern;

  JdkPattern(Pattern pattern) {
    this.pattern = Preconditions.checkNotNull(pattern);
  }

  @Override
  public CommonMatcher matcher(CharSequence t) {

    // Path traversal patterns
    private static final Pattern TRAVERSAL_PATTERN = Pattern.compile("\\.\\.[\\\\/]|[\\\\/]\\.\\.");
    private static final Pattern DOUBLE_DOT_PATTERN = Pattern.compile("\\.\\.");
    private static final Pattern ENCODED_TRAVERSAL = Pattern.compile("%2e%2e|%252e%252e", Pattern.CASE_INSENSITIVE);

    private final Pattern releaseNotesJavadocPattern = Pattern.compile("javadoc/(.*?\\.html)");
    // <a href="userguide/upgrading_version_8.html#changes_@baseVersion@">
    private final Pattern releaseNotesUserGuidePattern = Pattern.compile("userguide/(.*?)(?=\\.html)");
    // <a href="samples/sample_problems_api_usage.html">
    private final Pattern releaseNotesSamplesPattern = Pattern.compile("samples/(.*?)(?=\\.html)");

    /**
     * Test adding invalid regex include pattern
     */
    public void test_addInclude_invalidRegex() {
        String sessionId = "test-session-004";
        urlFilter.init(sessionId);

        // Invalid regex pattern should be handled gracefully
        urlFilter.addInclude(".*[invalid");
        urlFilter.addInclude("https://valid.com/.*");

        // Valid pattern should still work

    }

    /**
     * Converts to {@link Float}.
     *
     * @param o
     *            The object to convert
     * @param pattern
     *            The pattern string
     * @return The converted {@link Float}
     */
    public static Float toFloat(final Object o, final String pattern) {
        if (o == null) {
            return null;
        } else if (o instanceof Float) {
            return (Float) o;

    }

    /**
     * Converts a GSA URL pattern into a regular expression pattern suitable for Fess.
     * Handles various GSA pattern formats including regexp, contains, and URL-based patterns.
     *
     * @param s the input GSA pattern string
     * @return a regular expression pattern string, or empty string for comments/invalid patterns
     */
    protected String getFilterPath(final String s) {