# Questions on "Guess Values"

**URL:** https://community.mp3tag.de/t/questions-on-guess-values/17360
**Category:** Support
**Created:** [November 7, 2015, 10:23am UTC](https://community.mp3tag.de/t/questions-on-guess-values/17360 "2015-11-07T10:23:21Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![Lennuj420](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/l/b3f665/32.png) [@Lennuj420](https://community.mp3tag.de/u/Lennuj420)
#### Post date: [November 7, 2015, 10:23am UTC](https://community.mp3tag.de/t/questions-on-guess-values/17360/1 "2015-11-07T10:23:21Z")

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> [@Move "Featuring" from Artist to Title](https://community.mp3tag.de/t/move-featuring-from-artist-to-title/11096/1):
>
> _to format the %artist% tag-field:_  
> Action: Format Value  
> Field: ARTIST  
> Formatstring: $regexp(%artist%,(.+?) ((?:featuring|feat|ft).?) (.+),'$1 ($2 $3)')
> 
> _to format the filename and leave the %artist% field as it is:_  
> Converter: Tag - Filename  
> _OR_  
> Action: Format Value  
> Field: \_FILENAME  
> Formatstring: $num(%track%,2) - $regexp(%artist%,(.+?) ((?:featuring|feat|ft).?) (.+),'$1 ($2 $3)') - %title%

hi sir **pone** , i would like to ask if where i can find all the list and description of the guess values... i searched the net and there is no specific description all the guess values and what does it do... its a big favor to ask but i am really interested to know about this guessing values and im planning to write an action scripts for mp3tag in the future.

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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: [November 7, 2015, 10:30am UTC](https://community.mp3tag.de/t/questions-on-guess-values/17360/2 "2015-11-07T10:30:45Z")

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"Guessing the values" means that you have a certain structure in a string and assign identifyable chunks from this string to certain fields.  
It works just like the Convert\>Filename-Tag function.

To see a list of standard fields, see the help:  
[https://docs.mp3tag.de/mapping](https://docs.mp3tag.de/mapping)  
The column "Names in Mp3tag" shows the variable name that has to be enclosed in %.

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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, 12:25pm UTC](https://community.mp3tag.de/t/questions-on-guess-values/17360/3 "2026-02-09T12:25:56Z")

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