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/* * @license * * Copyright (c) 2011-2014, Christopher Jeffrey. (MIT Licensed) * https://github.com/chjj/marked * * Copyright (c) 2018, Костя Третяк. (MIT Licensed) * https://github.com/ts-stack/markdown */
export class ExtendRegexp {  private source: string;  private flags: string;
  constructor(regex: RegExp, flags: string = "") {    this.source = regex.source;    this.flags = flags;  }
  /**   * Extend regular expression.   *   * @param groupName Regular expression for search a group name.   * @param groupRegexp Regular expression of named group.   */  setGroup(groupName: RegExp | string, groupRegexp: RegExp | string): this {    let newRegexp: string = typeof groupRegexp == "string"      ? groupRegexp      : groupRegexp.source;    newRegexp = newRegexp.replace(/(^|[^\[])\^/g, "$1");
    // Extend regexp.    this.source = this.source.replace(groupName, newRegexp);    return this;  }
  /**   * Returns a result of extending a regular expression.   */  getRegexp(): RegExp {    return new RegExp(this.source, this.flags);  }}