# Questions about Replace with regular expression and excepting specified filed
**URL:** https://community.mp3tag.de/t/questions-about-replace-with-regular-expression-and-excepting-specified-filed/7448
**Category:** Support
**Created:** [November 9, 2008, 9:49am UTC](https://community.mp3tag.de/t/questions-about-replace-with-regular-expression-and-excepting-specified-filed/7448 "2008-11-09T09:49:29Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@donghaerang](https://community.mp3tag.de/u/donghaerang)
#### Post date: [November 9, 2008, 9:49am UTC](https://community.mp3tag.de/t/questions-about-replace-with-regular-expression-and-excepting-specified-filed/7448/1 "2008-11-09T09:49:29Z")
At first, sorry for my poor English.
I have tried to understand but I can't still now.
I have 2 questions.
Q1. I want to change
AA@55555@BB@666666
to
AA@@@55555\_BB@@666666
with Replace with regular expression.
A, B is random character A~Z.
5, 6 is random number 0~9.
@ means space.
How can I change this with Replace with regular expression?
Q2. I want to use Actions(e.g: Case conversion, Replace, etc..) in all field except some specified fields I want.
How can I except these in any actions?
Help me please.
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### Author:  [@system](https://community.mp3tag.de/u/system)
#### Post date: [February 9, 2026, 12:21pm UTC](https://community.mp3tag.de/t/questions-about-replace-with-regular-expression-and-excepting-specified-filed/7448/2 "2026-02-09T12:21:12Z")