Method getExpr

src/service/variable-source.js:265–271

* Returns a Regular expression that can be used to detect all the variables * in a template. * @param {!{[key: string]: *}=} opt_bindings * @param {!{[key: string]: boolean}=} opt_allowlist Optional allowlist of names * that can be substituted. * @return {!RegExp}

(opt_bindings, opt_allowlist)

   * @return {!RegExp}
   */
  getExpr(opt_bindings, opt_allowlist) {
    if (!this.initialized_) {
      this.initialize_();
    }
    const all = {...this.replacements_, ...opt_bindings};
    return this.buildExpr_(Object.keys(all), opt_allowlist);
  }

  /**
   * @param {!Array<string>} keys