# Double digit track numbers

**URL:** <https://community.mp3tag.de/t/double-digit-track-numbers/10486>\
**Category:** Support\
**Created:** [May 28, 2010, 8:10pm UTC](https://community.mp3tag.de/t/double-digit-track-numbers/10486 "2010-05-28T20:10:27Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![rymd](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/r/76d3ee/32.png) [@rymd](https://community.mp3tag.de/u/rymd)\
**Post date:** [May 28, 2010, 8:10pm UTC](https://community.mp3tag.de/t/double-digit-track-numbers/10486/1 "2010-05-28T20:10:27Z")

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Hey,  
I'm sure this has been asked before but I can't find it.. and the one solution I did find didn't work.  
Is it possible, using regular expressions, to put 0's before all file names with single digit (1-9) track names? All my files are named: 1 - song name, but it should be 01 - song name  
I figured out the auto numbering system too late and I have a LOT of mp3s that need to be renamed. If not a way to rename file names, surely there is a way to add 0's to only single digit track numbers so I can convert tag -\> filename?

Thanks

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**Author:** ![duckredbeard](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/d/d9b06d/32.png) [@duckredbeard](https://community.mp3tag.de/u/duckredbeard)\
**Post date:** [May 28, 2010, 8:41pm UTC](https://community.mp3tag.de/t/double-digit-track-numbers/10486/2 "2010-05-28T20:41:03Z")

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Use autonumbering wizard to renumber them, there is an option for the leading 0. Then use the Tag\>Filename to rename. Be careful that you don't change the significant digit of the track, I would recommend doing one album at a time. Perhaps copy a few folders over to a temp folder and practice on that until you are comfortable doing larger batches.

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**Author:** ![stanman](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/s/c5a1d2/32.png) [@stanman](https://community.mp3tag.de/u/stanman)\
**Post date:** [May 28, 2010, 11:30pm UTC](https://community.mp3tag.de/t/double-digit-track-numbers/10486/3 "2010-05-28T23:30:32Z")

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Create an Action and use Format value. For Field: put in "TRACK" and for Format string: put in $num(%track%,2). Then do Convert Tag - Filename.

That way you can do your whole library at the same time.

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**Author:** ![rymd](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/r/76d3ee/32.png) [@rymd](https://community.mp3tag.de/u/rymd)\
**Post date:** [May 28, 2010, 11:45pm UTC](https://community.mp3tag.de/t/double-digit-track-numbers/10486/4 "2010-05-28T23:45:34Z")

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Perfect, thanks!

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**Author:** ![Florian](https://community.mp3tag.de/user_avatar/community.mp3tag.de/florian/32/5759_2.png) [@Florian](https://community.mp3tag.de/u/Florian)\
**Post date:** [December 1, 2024, 11:14pm UTC](https://community.mp3tag.de/t/double-digit-track-numbers/10486/6 "2024-12-01T23:14:56Z")

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