# Help request - Extra substring in filename for specific field

**URL:** <https://community.mp3tag.de/t/help-request-extra-substring-in-filename-for-specific-field/17557>\
**Category:** Support\
**Created:** [January 16, 2016, 4:20pm UTC](https://community.mp3tag.de/t/help-request-extra-substring-in-filename-for-specific-field/17557 "2016-01-16T16:20:00Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![djrdb](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/d/ee7513/32.png) [@djrdb](https://community.mp3tag.de/u/djrdb)\
**Post date:** [January 16, 2016, 4:20pm UTC](https://community.mp3tag.de/t/help-request-extra-substring-in-filename-for-specific-field/17557/1 "2016-01-16T16:20:00Z")

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Hello all,

I am a DJ and use the "Composer" field to list a track's remixer. I use MP3TAG to rename all my MP3s with format similar to example below:

> _Madonna - Living For Love (Stonebridge Remix)_

Is there an Action I can create to put "Stonebridge" from the above example in the Composer field?

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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:** [January 16, 2016, 5:08pm UTC](https://community.mp3tag.de/t/help-request-extra-substring-in-filename-for-specific-field/17557/2 "2016-01-16T17:08:21Z")

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You can use the "Guess values" (import tag field) action for the field:  
%dummy%(%composer% %dummy%)  
THis will probably work only for 2-word-strings inside the parenthesis.

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**Author:** ![djrdb](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/d/ee7513/32.png) [@djrdb](https://community.mp3tag.de/u/djrdb)\
**Post date:** [January 16, 2016, 5:39pm UTC](https://community.mp3tag.de/t/help-request-extra-substring-in-filename-for-specific-field/17557/3 "2016-01-16T17:39:42Z")

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SOLUTION!

After that post, I dug into the help file and was able to solve my own problem.

My solution duplicates the Title in the Composer field and then uses **Regular Expression** to remove the unwanted text, spaces, characters, etc...

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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:** [January 17, 2016, 8:21am UTC](https://community.mp3tag.de/t/help-request-extra-substring-in-filename-for-specific-field/17557/4 "2016-01-17T08:21:24Z")

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Fine if it worked.  
You still could have used the action of the type "Guess value" for COMPOSER and the pattern  
%dummy% (%composer %dummy%)  
or  
%dummy% (%composer Remix)

It would have been nice to see the regular expression that you used for your solution.

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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:** [February 9, 2026, 12:26pm UTC](https://community.mp3tag.de/t/help-request-extra-substring-in-filename-for-specific-field/17557/5 "2026-02-09T12:26:03Z")

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Closed on February 9, 2026, 12:26pm UTC