# How to perform a tag \> tag conversion using only part of the info in the source field
**URL:** https://community.mp3tag.de/t/how-to-perform-a-tag-tag-conversion-using-only-part-of-the-info-in-the-source-field/68940
**Category:** Support
**Created:** [June 25, 2025, 6:00am UTC](https://community.mp3tag.de/t/how-to-perform-a-tag-tag-conversion-using-only-part-of-the-info-in-the-source-field/68940 "2025-06-25T06:00:00Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@MP3TaggingJ](https://community.mp3tag.de/u/MP3TaggingJ)
#### Post date: [June 25, 2025, 6:00am UTC](https://community.mp3tag.de/t/how-to-perform-a-tag-tag-conversion-using-only-part-of-the-info-in-the-source-field/68940/1 "2025-06-25T06:00:00Z")
I have a problem that involves using a "tag \> tag" conversion with a regular expressions.
As an example, in the Title field, I have: "The Sleeping Beauty (Suite), Op. 66a, TH. 234: I. Introduction - The Lilac Fairy." I want to take the info about the work only ("The Sleeping Beauty (Suite), Op. 66a, TH. 234"), and make it the album title.
What I've used unsuccessfully is this tag \> tag conversion: "`$regexp(%TITLE%,(.*) - .*,$1)`" Unfortunately, that succeeds in copying all the Title info, when I only want the first part.
I'm unable to find a way to format the regexp value to do that.
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### Author:  [@LyricsLover](https://community.mp3tag.de/u/LyricsLover)
#### Post date: [June 25, 2025, 6:12am UTC](https://community.mp3tag.de/t/how-to-perform-a-tag-tag-conversion-using-only-part-of-the-info-in-the-source-field/68940/2 "2025-06-25T06:12:33Z")
If you want to split/cut at `:` then use this `:` instead of the minus:
`$regexp(%TITLE%,(.*): .*,$1)`
Would be translated as follows:
Keep everything to the left of the colon `:` followed by a space, and throw away the rest.
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### Author:  [@MP3TaggingJ](https://community.mp3tag.de/u/MP3TaggingJ)
#### Post date: [June 25, 2025, 6:39am UTC](https://community.mp3tag.de/t/how-to-perform-a-tag-tag-conversion-using-only-part-of-the-info-in-the-source-field/68940/3 "2025-06-25T06:39:09Z")
Perfect! That got it!
I really appreciate your help--again!
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### Author:  [@system](https://community.mp3tag.de/u/system)
#### Post date: [July 25, 2025, 6:40am UTC](https://community.mp3tag.de/t/how-to-perform-a-tag-tag-conversion-using-only-part-of-the-info-in-the-source-field/68940/4 "2025-07-25T06:40:01Z")
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