# Changing part of filename **URL:** https://community.mp3tag.de/t/changing-part-of-filename/68557 **Category:** Support **Created:** [May 20, 2025, 12:49pm UTC](https://community.mp3tag.de/t/changing-part-of-filename/68557 "2025-05-20T12:49:46Z") **Posts on this page:** 20 **Page:** 1
### Author: ![Light](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/l/2acd7d/32.png) [@Light](https://community.mp3tag.de/u/Light) #### Post date: [May 20, 2025, 12:49pm UTC](https://community.mp3tag.de/t/changing-part-of-filename/68557/1 "2025-05-20T12:49:46Z")
I just want to change part of filename, in my case the number, from 000 to 001 and so on. I have so many files so it would be easier to do it in groups of about 20 files. Is that a way? The rest of the filename need to be untouched. ---
### 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: [May 20, 2025, 12:58pm UTC](https://community.mp3tag.de/t/changing-part-of-filename/68557/2 "2025-05-20T12:58:19Z")
I don't quite understand - you want to increase a number by "1"? Or do you simply want to replace an existing number by a different one? Best for better suggestions would be a real example. ---
### Author: ![LyricsLover](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/l/c6cbf5/32.png) [@LyricsLover](https://community.mp3tag.de/u/LyricsLover) #### Post date: [May 20, 2025, 1:05pm UTC](https://community.mp3tag.de/t/changing-part-of-filename/68557/3 "2025-05-20T13:05:49Z")
> [@Light](#): > > I just want to change part of filename, in my case the number, from 000 to 001 and so on. And please let us know where you get the new number from? An example with your current real filename and your new filename would help a lot. A [screenshot](https://community.mp3tag.de/t/hints-for-asking-support-requests/56190#use-screenshots-to-exemplify-the-issue-2) from your fields in Alt+ T where you probably get your number would help too. ---
### Author: ![Light](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/l/2acd7d/32.png) [@Light](https://community.mp3tag.de/u/Light) #### Post date: [May 20, 2025, 2:05pm UTC](https://community.mp3tag.de/t/changing-part-of-filename/68557/4 "2025-05-20T14:05:42Z")
The number is my way of organize a lot of music files into a larger work. I found out after about 35 pieces of music that I wanted to place some files before the ones that were already named. ---
### Author: ![Light](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/l/2acd7d/32.png) [@Light](https://community.mp3tag.de/u/Light) #### Post date: [May 20, 2025, 2:08pm UTC](https://community.mp3tag.de/t/changing-part-of-filename/68557/5 "2025-05-20T14:08:29Z")
I want to replace the number in the start of the filename, only the number. ---
### 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: [May 20, 2025, 2:09pm UTC](https://community.mp3tag.de/t/changing-part-of-filename/68557/6 "2025-05-20T14:09:11Z")
As I said: a real example would help a lot. Without that: Try Convert\>Tag-Tag for \_FILENAME Format string: `$num(%_counter%,3) - $regexp(%_filename%,\d+ ,)` ---
### Author: ![Light](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/l/2acd7d/32.png) [@Light](https://community.mp3tag.de/u/Light) #### Post date: [May 20, 2025, 2:15pm UTC](https://community.mp3tag.de/t/changing-part-of-filename/68557/7 "2025-05-20T14:15:05Z")
![Name change](https://community.mp3tag.de/uploads/default/original/3X/5/7/57161f70a5bd2158784752614a96f4d9a0779731.jpeg) ---
### Author: ![ohrenkino](https://community.mp3tag.de/user_avatar/community.mp3tag.de/ohrenkino/32/4843_2.png) [@ohrenkino](https://community.mp3tag.de/u/ohrenkino) #### Post date: [May 20, 2025, 2:16pm UTC](https://community.mp3tag.de/t/changing-part-of-filename/68557/8 "2025-05-20T14:16:49Z")
Thank you. So select all files as %\_counter% always starts at "1". Then use the following Format string: `$num(%_counter%,3) - $regexp(%_filename%,\d+ - ,)` ---
### Author: ![Light](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/l/2acd7d/32.png) [@Light](https://community.mp3tag.de/u/Light) #### Post date: [May 20, 2025, 2:17pm UTC](https://community.mp3tag.de/t/changing-part-of-filename/68557/9 "2025-05-20T14:17:18Z")
All this files I want 001 in the start, and the following will therefore also need a change. ---
### Author: ![LyricsLover](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/l/c6cbf5/32.png) [@LyricsLover](https://community.mp3tag.de/u/LyricsLover) #### Post date: [May 20, 2025, 2:19pm UTC](https://community.mp3tag.de/t/changing-part-of-filename/68557/10 "2025-05-20T14:19:40Z")
Please show us some NEW file names as you would like them after renaming. ---
### Author: ![Light](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/l/2acd7d/32.png) [@Light](https://community.mp3tag.de/u/Light) #### Post date: [May 20, 2025, 2:21pm UTC](https://community.mp3tag.de/t/changing-part-of-filename/68557/11 "2025-05-20T14:21:31Z")
001 - From the Earth to the Sky 01 - Medieval sacred ballad ---
### Author: ![LyricsLover](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/l/c6cbf5/32.png) [@LyricsLover](https://community.mp3tag.de/u/LyricsLover) #### Post date: [May 20, 2025, 2:24pm UTC](https://community.mp3tag.de/t/changing-part-of-filename/68557/12 "2025-05-20T14:24:23Z")
Please show us 3 examples to see the principle behind it. Like OLD: ```auto 000 - From the Earth to the Sky 01 - Medieval sacred ballad 000 - From the Earth to the Sky 02 - Medieval sacred ballad 000 - From the Earth to the Sky 03 - Medieval sacred ballad ``` NEW: ```auto 001 - From the Earth to the Sky 01 - Medieval sacred ballad 002 - From the Earth to the Sky 02 - Medieval sacred ballad 003 - From the Earth to the Sky 03 - Medieval sacred ballad ``` or NEW ```auto 001 - From the Earth to the Sky 01 - Medieval sacred ballad 001 - From the Earth to the Sky 02 - Medieval sacred ballad 001 - From the Earth to the Sky 03 - Medieval sacred ballad ``` ---
### Author: ![Light](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/l/2acd7d/32.png) [@Light](https://community.mp3tag.de/u/Light) #### Post date: [May 20, 2025, 2:25pm UTC](https://community.mp3tag.de/t/changing-part-of-filename/68557/13 "2025-05-20T14:25:52Z")
The last example is the right, because they have all the same title. ---
### Author: ![LyricsLover](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/l/c6cbf5/32.png) [@LyricsLover](https://community.mp3tag.de/u/LyricsLover) #### Post date: [May 20, 2025, 2:26pm UTC](https://community.mp3tag.de/t/changing-part-of-filename/68557/14 "2025-05-20T14:26:51Z")
So you just want to replace all occurings of `000` with `001`? ---
### Author: ![Light](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/l/2acd7d/32.png) [@Light](https://community.mp3tag.de/u/Light) #### Post date: [May 20, 2025, 2:27pm UTC](https://community.mp3tag.de/t/changing-part-of-filename/68557/15 "2025-05-20T14:27:15Z")
So all the files in the picture should have 001. ---
### Author: ![Light](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/l/2acd7d/32.png) [@Light](https://community.mp3tag.de/u/Light) #### Post date: [May 20, 2025, 2:29pm UTC](https://community.mp3tag.de/t/changing-part-of-filename/68557/16 "2025-05-20T14:29:48Z")
Yes, more than 30 pieces of music in many musical variations. ---
### 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: [May 20, 2025, 2:31pm UTC](https://community.mp3tag.de/t/changing-part-of-filename/68557/17 "2025-05-20T14:31:55Z")
> [@Light](#): > > So all the files in the picture should have 001. Then use Format string: `$replace(%_filename%,000,001)` I do not have much hope to define a criterion that increases the generated number unless you use the track numbering wizard Ctrl-K with a suitable criterion like "New disc on change of TITLE" and you write that number to DISCNUMBER. Finally, you create a new filename from tags with that DISCNUMBER at the front. Otherwise I see no way to automate that. ---
### Author: ![Light](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/l/2acd7d/32.png) [@Light](https://community.mp3tag.de/u/Light) #### Post date: [May 20, 2025, 2:35pm UTC](https://community.mp3tag.de/t/changing-part-of-filename/68557/18 "2025-05-20T14:35:08Z")
It's importante to keep the rest of the name. ---
### Author: ![Light](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/l/2acd7d/32.png) [@Light](https://community.mp3tag.de/u/Light) #### Post date: [May 20, 2025, 2:36pm UTC](https://community.mp3tag.de/t/changing-part-of-filename/68557/19 "2025-05-20T14:36:47Z")
I do not need to increase the numbers in the group. ---
### 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: [May 20, 2025, 2:38pm UTC](https://community.mp3tag.de/t/changing-part-of-filename/68557/20 "2025-05-20T14:38:25Z")
> [@Light](#): > > I do not need to increase the numbers That makes it more difficult. Have you tried the track numbering wizard and checked what it wrote into DISCNUMBER? [Next page](https://community.mp3tag.de/t/changing-part-of-filename/68557.md?page=2)