} else {
        builder.append(c);
        inMatchingGroup = false;
      }
    }
    return builder.toString();
  }

  /**
   * @deprecated Provided only to satisfy the {@link Predicate} interface; use {@link #matches}
   *     instead.
   */
  @Deprecated
  @Override
  public boolean apply(Character character) {
    return matches(character);
  }

  /**

      } else {
        builder.append(c);
        inMatchingGroup = false;
      }
    }
    return builder.toString();
  }

  /**
   * @deprecated Provided only to satisfy the {@link Predicate} interface; use {@link #matches}
   *     instead.
   */
  @Deprecated
  @Override
  public boolean apply(Character character) {
    return matches(character);
  }

  /**