# Add a dot to a number
**URL:** https://community.mp3tag.de/t/add-a-dot-to-a-number/13329
**Category:** Support
**Created:** [April 16, 2012, 11:44am UTC](https://community.mp3tag.de/t/add-a-dot-to-a-number/13329 "2012-04-16T11:44:56Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@Patu](https://community.mp3tag.de/u/Patu)
#### Post date: [April 16, 2012, 11:44am UTC](https://community.mp3tag.de/t/add-a-dot-to-a-number/13329/1 "2012-04-16T11:44:56Z")
Sorry, I'm a newbie to this.
I've been trying to add a dot at the end of one or more numbers by searching for \d and replacing it with \d. But that doesn't work at all.
There are three problems:
1. I don't know whether to use action type "replace" or "replace with regular expression".
2. I don't know how to replace a number with itself + a dot (e.g. "1" = "1.").
3. The dot should only appear at the very end of a string of numbers ("123" = "123.").
Any idea?
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### Author:  [@stevehero](https://community.mp3tag.de/u/stevehero)
#### Post date: [April 16, 2012, 12:13pm UTC](https://community.mp3tag.de/t/add-a-dot-to-a-number/13329/2 "2012-04-16T12:13:18Z")
use reg exp on TITLE tag for instance: (\d+)
replace with: $1.
The () capture whatever regexp is placed inside and the + captures the digits until it can't find any more.
The $1 with the . Replaces the captured regexp with a . At the end.
Hope this helps.
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### Author:  [@Patu](https://community.mp3tag.de/u/Patu)
#### Post date: [April 16, 2012, 2:24pm UTC](https://community.mp3tag.de/t/add-a-dot-to-a-number/13329/3 "2012-04-16T14:24:17Z")
Great, Steve. That was very helpful.
It's just amazing to watch mp3tag change Hundreds of files in a wink.
Thank you. Thank you. Thank you.
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### Author:  [@stevehero](https://community.mp3tag.de/u/stevehero)
#### Post date: [April 16, 2012, 3:18pm UTC](https://community.mp3tag.de/t/add-a-dot-to-a-number/13329/4 "2012-04-16T15:18:12Z")
No problem. If your interested in learning regexp.
A great resource is www.regular-expressions.info/
I also bought a program called regexbuddy which is around $30 but definatly increases your learning curve a lot.
Glad to help and welcome to the forum.
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### Author:  [@system](https://community.mp3tag.de/u/system)
#### Post date: [February 9, 2026, 12:23pm UTC](https://community.mp3tag.de/t/add-a-dot-to-a-number/13329/5 "2026-02-09T12:23:47Z")