regexOps clarification needed

[Chilace]

These are feed settings:

"566000436feed43com>23537": {
  "title": "Sai 2.0 Development Feed",
  "link": "https://feed43.com/4432030375688680.xml",
  "channel": "204593356007931905",
  "addedOn": "2018-12-15T06:24:35.841Z",
  "message": "📰  |  **{title}**\n\n{description:newline}\n\n{link}\n\n{date}\n\n{subscriptions}",
  "regexOps": {
    "description": [
      {
        "name": "newline",
        "search": {
          "flags": "g",
          "regex": "\\s(\\[(?:Fixed|Changes|New)| *- )|\\*-- Delivered by Feed43 service\\*"
        },
        "replacement": "\n$1"
      }
    ]
  }
}

and that is what I get:

Some test:
https://runkit.com/chilace/5c14d678cf5f680012b650f0

The question is how to replace matches with a captured group?

[Chilace]

By the way, to see embedded code from RunKit you can install its app:
https://blog.github.com/2018-12-10-introducing-content-attachments-api/

[Chilace]

In the meantime I will use this:
https://github.com/Chilace/Discord.RSS/commit/96dc9c73f1d72964ce1d750666b4b057ba29d956
You need "custom": true in the search object of the feed config for this to work, e.x.:

"566000436feed43com>23537": {
  "title": "Sai 2.0 Development Feed",
  "link": "https://feed43.com/4432030375688680.xml",
  "channel": "204593356007931905",
  "addedOn": "2018-12-15T06:24:35.841Z",
  "message": "📰  |  **{title}**\n\n{description:newline}\n\n{link}\n\n{date}\n\n{subscriptions}",
  "regexOps": {
    "description": [
      {
        "name": "newline",
        "search": {
          "custom": true,
          "flags": "g",
          "regex": "\\s(\\[(?:Fixed|Changes|New)| *- )|\\*-- Delivered by Feed43 service\\*"
        },
        "replacement": "\n$1"
      }
    ]
  }
}

[synzen]

To replace with a certain match and/or group, use the keys match and/or group

https://github.com/synzen/Discord.RSS/wiki/Custom-Placeholders-via-Regex-Ops#usagesyntax

[Chilace]

It's not possible:

1. Case:

"regexOps": {
  "description": [
    {
      "name": "newline",
      "search": {
        "flags": "g",
        "regex": "\\s(\\[(?:Fixed|Changes|New)| *- )|\\*-- Delivered by Feed43 service\\*",
        "group": 1
      },
      "replacement": "\n$1"
    }
  ]
}

In this case match is [Fixed and captured group is [Fixed. Since new RegExp was created from this match/group I have not access to captured group in replacement string \n$1 and this new Regexp replaces only the first match from the original regex.

2. Case:

"regexOps": {
  "description": [
    {
      "name": "newline",
      "search": {
        "flags": "g",
        "regex": "\\s(\\[(?:Fixed|Changes|New)| *- )|\\*-- Delivered by Feed43 service\\*",
        "group": 1
      },
      "replacement": "\n$&"
    }
  ]
}

Note - here I am trying to replace with the \n + last match

In this case match is [Fixed and captured group is [Fixed. Since new RegExp was created from this match/group I'am trying replace with \n + last match \n$& and new Regexp replaces only the first match from the original regex.

But I need replace all matches (not groups) with first group in original regex and it's not possible if I specify the match/group.

Ok let's try this part of code:
https://github.com/synzen/Discord.RSS/blob/dev/structs/Article.js#L70
and replace with \n + lastmatch (since I have not access to groups in original regex):

Below is the configured message to be sent for this feed:

--
:newspaper:  |  Sai 2.0 Development Feed
2018-05-26
 [Fixed Bugs]







 - [Resize Canvas] Internal data are corrupted when other canvas was closed after expansion of canvas size.







 - [Selection] Old selections are not deselected when do [Select All].







 - [View] The layouts of embedded views are corrupted after activated a floating view and next closed an embedded view.
 [Changes]







 - [Multicore Operation] Modulated the priority of each thread.







 - [Bristle] Re-tuned the quality and speed of the painting.







 - [Bristle] Improved the detection of turn.







 - [Brush Tools] Changed to apply [Blend] instead of [Dilution] to transparent color painting. (Changed to the behavior same as Ver.1.)







 - [Options Dialog] Added a checkbox [Do not hide separated panels when turned off [Show All User Interface Panels]].
-- Delivered by Feed43 service
https://www.systemax.jp/en/sai/devdept.html
вс, 16 декабря 2018, 3:20 дня MSK

In this case matches are:

0: [" [Fixed", "[Fixed"]
1: [" - ", "- "]
2: [" - ", "- "]
3: [" - ", "- "]
4: [" [Changes", "[Changes"]
5: [" - ", "- "]
6: [" - ", "- "]
7: [" - ", "- "]
8: [" - ", "- "]
9: [" - ", "- "]
10: ["*-- Delivered by Feed43 service*", undefined]

11 new instances of RegExp, every replacement of match - adds new line

[Chilace]

Just for testing:
https://runkit.com/chilace/5c17349b4eec31001249ce8c

[Chilace]

It is difficult to explain what I want in English.
I want to replace all matches in original {description} with a captured group in the original regexp.
(without creating a bunch of new regexp instances)

"regexOps": {
  "description": [
    {
      "name": "newline",
      "search": {
        "custom": true,
        "flags": "g",
        "regex": "\\s(\\[(?:Fixed|Changes|New)| *- )|\\*-- Delivered by Feed43 service\\*"
      },
      "replacement": "\n$1"
    }
  ]
}

with this commit https://github.com/Chilace/Discord.RSS/commit/96dc9c73f1d72964ce1d750666b4b057ba29d956

as a result:

[synzen]

Yes I understand now, try 62ddc26. Replace the replacement key in the regex op object with replacementDirect - it should function the same as your thing here

[Chilace]

It works, thank you!

@Macley-Kun