# Artist1/Artist2 should become Artist1 - Song title (feat. Artist 2)
**URL:** https://community.mp3tag.de/t/artist1-artist2-should-become-artist1-song-title-feat-artist-2/68982
**Category:** Support
**Created:** [June 29, 2025, 5:09pm UTC](https://community.mp3tag.de/t/artist1-artist2-should-become-artist1-song-title-feat-artist-2/68982 "2025-06-29T17:09:38Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@domimilagro](https://community.mp3tag.de/u/domimilagro)
#### Post date: [June 29, 2025, 5:09pm UTC](https://community.mp3tag.de/t/artist1-artist2-should-become-artist1-song-title-feat-artist-2/68982/1 "2025-06-29T17:09:38Z")
Hey, I've been using ChatGPT for about a half an hour but nothing it tells me works. Maybe you could help me 😕
I tried all the above, and what happens is it shortens ARTIST: Artist1/Artist2/Artist3 to Artist1, but in the TITLE it changes it to
"Song title (feat. REGEXP ERROR: Regular expression
Invalid preceding regular expression prior to repetition operator. The error occurred while parsing the regular expression: '^+\>\>\>HERE\>\>\> & (.+)$'.)"
Many thanks in advance! 😕
* * *
- Input: `ARTIST` field contains multiple artists separated by slashes, e.g.
`Artist1/Artist2/Artist3/Artist4`
- Desired output:
- `ARTIST` field should keep only the **first artist** (e.g. `Artist1`)
- `TITLE` field should be appended with `(feat. Artist2, Artist3 & Artist4)`
- Use commas to separate all featured artists except the last one, which is joined by `&`
- If only one featured artist (e.g. `Artist1/Artist2`), then `TITLE` is appended with `(feat. Artist2)` (no ampersand)
# What I tried so far
I tried to create an Mp3tag action group with these steps:
### 1. Save original ARTIST field to a temporary tag
- Action: Format tag field
- Field: `ARTIST_ORIGINAL`
- Format string:
```auto
%ARTIST%
```
This is to keep a backup of the original list of artists, because we will modify the `ARTIST` field next.
### 2. Shorten `ARTIST` to only the first artist
- Action: Replace with regular expression
- Field: `ARTIST`
- RegEx:
```auto
^([^/]+).*
```
- Replace with:
```auto
$1
```
* * *
### 3. Extract all remaining artists (except the first) into a temporary field `TMP_FEAT`
- Action: Format tag field
- Field: `TMP_FEAT`
- Format string:
```auto
$regexp(%ARTIST_ORIGINAL%,^[^/]+/(.+)$,$1)
```
* * *
### 4. Replace slashes `/` in `TMP_FEAT` with commas and an ampersand before the last artist
I tried this to convert `/` into proper formatting like `Artist2, Artist3 & Artist4`:
- Action: Format tag field
- Field: `TMP_FEAT`
- Format string:
```auto
$replace($regexp(%TMP_FEAT%,^(.*)/(.+)$,$1 & $2),/,\,)
```
* * *
### 5. Append `(feat. TMP_FEAT)` to the TITLE field, only if `TMP_FEAT` exists
- Action: Format tag field
- Field: `TITLE`
- Format string:
```auto
%TITLE%$if(%TMP_FEAT%, (feat. %TMP_FEAT%),)
```
* * *
### 6. (Optional) Remove the temporary field `TMP_FEAT` after processing
- Action: Remove tag field
- Field: `TMP_FEAT`
---
### Author:  [@LyricsLover](https://community.mp3tag.de/u/LyricsLover)
#### Post date: [June 29, 2025, 5:42pm UTC](https://community.mp3tag.de/t/artist1-artist2-should-become-artist1-song-title-feat-artist-2/68982/2 "2025-06-29T17:42:11Z")
I suggest trying your regular expressions in the 'Convert Tag -\> Tag' dialog first to see where the syntax error is.
The result of your regular expression is immediately visible in the text between your format string and the Preview button
The above syntax is not valid as a Mp3tag regular expression.
You can easily adjust the syntax in this dialogue window until it works for you.
Then you can also use the regular expression in an Action.
---
### Author:  [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)
#### Post date: [June 29, 2025, 5:51pm UTC](https://community.mp3tag.de/t/artist1-artist2-should-become-artist1-song-title-feat-artist-2/68982/3 "2025-06-29T17:51:50Z")
Try an action of the type "Guess value"
Source format: `$regexp('Artist1/Artist2/Artist3/Artist4',(.*?)\/(.*),$1)==%title% (feat. $regexp($replace($regexp('Artist1/Artist2/Artist3/Artist4',(.*?)/(.*),$2),/,', '),'(.*), (.*)',$1 & $2))`
Guessing pattern: %artist%==%title%
You can test the source format in Convert\>Tag-Tag which should show in the preview:
`"Artist1==Mytitle (feat. Artist2, Artist3 & Artist4)"`
---
### Author:  [@system](https://community.mp3tag.de/u/system)
#### Post date: [July 29, 2025, 5:52pm UTC](https://community.mp3tag.de/t/artist1-artist2-should-become-artist1-song-title-feat-artist-2/68982/4 "2025-07-29T17:52:42Z")
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