# Merging several Tag Fields into CONTENTGROUP

**URL:** https://community.mp3tag.de/t/merging-several-tag-fields-into-contentgroup/10616
**Category:** Support
**Created:** [July 4, 2010, 10:31pm UTC](https://community.mp3tag.de/t/merging-several-tag-fields-into-contentgroup/10616 "2010-07-04T22:31:01Z")
**Posts on this page:** 1
**Showing post:** 9

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### Author: ![ptrk.mj](https://community.mp3tag.de/user_avatar/community.mp3tag.de/ptrk.mj/32/300_2.png) [@ptrk.mj](https://community.mp3tag.de/u/ptrk.mj)
#### Post date: [September 22, 2010, 8:13pm UTC](https://community.mp3tag.de/t/merging-several-tag-fields-into-contentgroup/10616/9 "2010-09-22T20:13:32Z")

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Here it is

`(?:(?<=,)|(?<=\A)) ?([^,]*),(?=.*?(?<=,) ?\1(?=,|\z))`

> [@](#):
>
> The invalid expression is not recognized by versions earlier than 2.46b

Good you solved that. Any other changes concerning regex engine that don't appear in a changelog?

[Remove\_duplicates\_from\_comma\_\_or\_comma\_space\_\_delimited\_list.mta](https://community.mp3tag.de/uploads/default/original/2X/7/758c4f09b223099f1af8cff94c32a2a8ff92a0bf.mta) (226 Bytes)

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