return new JdkMatcher(pattern.matcher(t));
  }

  @Override
  public String pattern() {
    return pattern.pattern();
  }

  @Override
  public int flags() {
    return pattern.flags();
  }

  @Override
  public String toString() {
    return pattern.toString();
  }

  private static final class JdkMatcher extends CommonMatcher {
    final Matcher matcher;

  private static final char[] UPPER_HEX_DIGITS = "0123456789ABCDEF".toCharArray();

  /** If true we should convert space to the {@code +} character. */
  private final boolean plusForSpace;

  /**
   * An array of flags where for any {@code char c} if {@code safeOctets[c]} is true then {@code c}
   * should remain unmodified in the output. If {@code c >= safeOctets.length} then it should be
   * escaped.
   */

    return new JdkMatcher(pattern.matcher(t));
  }

  @Override
  public String pattern() {
    return pattern.pattern();
  }

  @Override
  public int flags() {
    return pattern.flags();
  }

  @Override
  public String toString() {
    return pattern.toString();
  }

  private static final class JdkMatcher extends CommonMatcher {
    final Matcher matcher;