# Conversion of a bunch of similar filenames
**URL:** https://community.mp3tag.de/t/conversion-of-a-bunch-of-similar-filenames/66275
**Category:** Support
**Created:** [October 16, 2024, 10:14am UTC](https://community.mp3tag.de/t/conversion-of-a-bunch-of-similar-filenames/66275 "2024-10-16T10:14:23Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@Roland](https://community.mp3tag.de/u/Roland)
#### Post date: [October 16, 2024, 10:14am UTC](https://community.mp3tag.de/t/conversion-of-a-bunch-of-similar-filenames/66275/1 "2024-10-16T10:14:23Z")
Among other things, I have an MP3 collection of 211 files without tags.
I would like to generate basic information from the file names.
However, these are slightly different in their structure.
I have searched in vain for a way to pre-sort them.
Who has a suitable idea for editing them using Guess-Values?
[Dateiliste.txt](https://community.mp3tag.de/uploads/short-url/2yhi89zfcMdyKz63MdlZUBPIrGt.txt) (20.5 KB)
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### Author:  [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)
#### Post date: [October 16, 2024, 11:41am UTC](https://community.mp3tag.de/t/conversion-of-a-bunch-of-similar-filenames/66275/2 "2024-10-16T11:41:05Z")
You could filter for files with a given number of hyphens and then treat these (with a common structure) in 1 go. And then filter for the next number and treat those.
This would be a suggestion for such a filter:
`"$add($len($regexp(%_filename%,'[^-]',)),1)" IS 5`
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### Author:  [@Roland](https://community.mp3tag.de/u/Roland)
#### Post date: [October 16, 2024, 3:32pm UTC](https://community.mp3tag.de/t/conversion-of-a-bunch-of-similar-filenames/66275/3 "2024-10-16T15:32:28Z")
Wow! 😃
It worked.
I tried to understand the tricky filter expression, but failed again.
Many thanks to regex guru. 🤗
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### Author:  [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)
#### Post date: [October 16, 2024, 3:47pm UTC](https://community.mp3tag.de/t/conversion-of-a-bunch-of-similar-filenames/66275/4 "2024-10-16T15:47:44Z")
The regular expression removes anything that is not a hyphen from the given string (here: Filename) and then checks the length of the leftover
`$add($len($regexp('24 - Bobby Fuller - D - CBS - 2639 - B - You Kiss Me.mp3','[^-]',)),1)`
returns 7
`$add($len($regexp('03 - Blossom Toes - D - Polydor 59180 - A - Ill Be Your Baby Tonight.mp3','[^-]',)),1)`
returns 6
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### Author:  [@Roland](https://community.mp3tag.de/u/Roland)
#### Post date: [October 16, 2024, 4:00pm UTC](https://community.mp3tag.de/t/conversion-of-a-bunch-of-similar-filenames/66275/5 "2024-10-16T16:00:04Z")
I've got it.
I searched in vain for a way to count the hyphens using a function.
You made my day! 🙂
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### Author:  [@system](https://community.mp3tag.de/u/system)
#### Post date: [November 15, 2024, 4:00pm UTC](https://community.mp3tag.de/t/conversion-of-a-bunch-of-similar-filenames/66275/6 "2024-11-15T16:00:47Z")
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