# Regexp help (HWV) **URL:** \ **Category:** Support\ **Created:** [September 27, 2018, 5:42pm UTC](https://community.mp3tag.de/t/regexp-help-hwv/43108 "2018-09-27T17:42:37Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![chad](https://community.mp3tag.de/user_avatar/community.mp3tag.de/chad/32/5696_2.png) [@chad](https://community.mp3tag.de/u/chad)\ **Post date:** [September 27, 2018, 5:42pm UTC](https://community.mp3tag.de/t/regexp-help-hwv/43108/1 "2018-09-27T17:42:37Z")
Whenever I have filenames with the following format: Suite HWV 452 in Gm (I - Allemande) I want to change it to: Suite in Gm, HWV 452 (I - Allemande) I wrote the following regexp to do this, but it doesn't work (no match is produced), even despite [regexp101.com](http://regexp101.com) telling me that it DOES work: Search for `HWV (\d+) in ([A-Ga-gm#]+)` Replace with: `in $2, HWV $1` (Note: the A-Ga-gm# accounts for things like G#m, Bb, D, etc. - shorthand ways of writing musical keys) I double-checked that it is indeed "Replace with regular expression," it's searching the correct field, and it is NOT case-sensitive. Edit: I just tried the same code with a quick action (Actions --\> Actions (Quick)) and it worked. But when the code runs as part of a preset action, it doesn't work. ---
**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:** [September 27, 2018, 6:03pm UTC](https://community.mp3tag.de/t/regexp-help-hwv/43108/2 "2018-09-27T18:03:16Z")
Everything looks good from what you're describing. Are there any other actions running before this one in the group that might alter the filename to a format that is not matching anymore? If not, can you please post a screenshot of the "Replace with regular expression" dialog. ---
**Author:** ![system](https://community.mp3tag.de/uploads/default/original/2X/c/ce7035d426cb755a7916793326d23b465222a407.png) [@system](https://community.mp3tag.de/u/system)\ **Post date:** [February 9, 2026, 12:27pm UTC](https://community.mp3tag.de/t/regexp-help-hwv/43108/3 "2026-02-09T12:27:41Z")