@Override
  @NotNull
  public String getDemoText() {
    return
      """
        ^[\\w\\.-]+@([\\w\\-]+|\\.)+[A-Z0-9]{2,4}(?x)
        \\x0g\\#\\p{Alpha}\\1(?#comment)
        .*\\Q...\\E$# end-of-line comment""";

  }
@Override
  @NotNull
  public String getDemoText()