# Replace last comma in title with colon

**URL:** https://community.mp3tag.de/t/replace-last-comma-in-title-with-colon/71594
**Category:** Support
**Created:** [July 11, 2026, 3:15pm UTC](https://community.mp3tag.de/t/replace-last-comma-in-title-with-colon/71594 "2026-07-11T15:15:40Z")
**Posts on this page:** 5
**Page:** 1

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### Author: ![dvdr](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/d/3ab097/32.png) [@dvdr](https://community.mp3tag.de/u/dvdr)
#### Post date: [July 11, 2026, 3:15pm UTC](https://community.mp3tag.de/t/replace-last-comma-in-title-with-colon/71594/1 "2026-07-11T15:15:40Z")

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Hi

with classical music, I often get a mix of different ways, a title is written.  
xxxx, xxxx, op.2, I. Largo  
or  
xxxx op. 2, I. Largo  
Is there a way, I can always just address the LAST comma in the title (no matter, how many commas the title contains) and replace it with a colon ?  
Thanks for you help!

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### Author: ![LyricsLover](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/l/c6cbf5/32.png) [@LyricsLover](https://community.mp3tag.de/u/LyricsLover)
#### Post date: [July 11, 2026, 3:34pm UTC](https://community.mp3tag.de/t/replace-last-comma-in-title-with-colon/71594/2 "2026-07-11T15:34:05Z")

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> [@dvdr](#):
>
> xxxx op. 2, I. Largo

You could try Convert Tag -\> Tag with  
`$regexp(%title%,',\s*(?!.*,)',': ')`

 ![image](https://community.mp3tag.de/uploads/default/original/3X/f/5/f50c037f7a0a286d55eaa77fd0944a7deeb4f524.png)

Examples:  
xxxx, xxxx, op.2, I. Largo  
---\>  
xxxx, xxxx, op.2: I. Largo  
or  
xxxx op. 2, I. Largo  
---\>  
xxxx op. 2: I. Largo

The regular expression  
`,\s*(?!.*,)`

works as follows:

- `,` → matches a literal comma.
- `\s*` → matches zero or more whitespace characters after the comma.
- `(?!.*,)` → negative lookahead: verifies that there is **no other comma** anywhere to the right of the current position.

As a result, only the **last comma** in the string is matched.

We can provide more specific suggestions if you show us complete, real-life examples.

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### Author: ![ohrenkino](https://community.mp3tag.de/user_avatar/community.mp3tag.de/ohrenkino/32/4843_2.png) [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)
#### Post date: [July 11, 2026, 3:41pm UTC](https://community.mp3tag.de/t/replace-last-comma-in-title-with-colon/71594/3 "2026-07-11T15:41:36Z")

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As there are many ways to skin a cat, here an alternative:  
`$regexp('xxxx, xxxx, xxxx, op.2, I. Largo','(.*), (.*?)',$1: $2)`

 ![grafik](https://community.mp3tag.de/uploads/default/original/3X/4/b/4bb40acb46db41942a7067d7e3a06602427afe50.png)

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### Author: ![dvdr](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/d/3ab097/32.png) [@dvdr](https://community.mp3tag.de/u/dvdr)
#### Post date: [July 11, 2026, 3:49pm UTC](https://community.mp3tag.de/t/replace-last-comma-in-title-with-colon/71594/4 "2026-07-11T15:49:13Z")

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> [@LyricsLover](#):
>
> You could try Convert Tag -\> Tag with  
> `$regexp(%title%,',\s*(?!.*,)',': ')`

Thank you very much - that does the trick!  
Especially thank you for explaining, how that regexp works: that makes me understand and hopefully be able to apply that lookup for a "last character" to other use-cases!

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### Author: ![system](https://community.mp3tag.de/uploads/default/original/2X/c/ce7035d426cb755a7916793326d23b465222a407.png) [@system](https://community.mp3tag.de/u/system)
#### Post date: [July 18, 2026, 3:49pm UTC](https://community.mp3tag.de/t/replace-last-comma-in-title-with-colon/71594/5 "2026-07-18T15:49:51Z")

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