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[jasonboudinot]

I have a single digit number in my comment field. Id like to add the text "Energy" before the number with a space between. Any help is appreciated. Replace or replace with regular expression? TIA

[ohrenkino]

@jasonboudinot

Replace or replace with regular expression?

Or this one from the FAQs:

Actions and batch-operations

How to append the string " xyz" to the content of a tag field? Create a new action in an existing action group and choose Format value as action type. Field specifies the tag field the formatting rule should be applied to. Format string must have the field placeholder for the field selected above and the string which should be appended. Example: If you want to append the string " xyz" to the current value of the comment field: Action type: Format value Field: COMMENT Format string: %com…

If you insist on a replace action, try "Replace with regular expression" for COMMENT
Search string: (.*)
Replace with: Energy $1

[Florian]

The FAQ entry @ohrenkino mentioned to is referring to the Windows version of Mp3tag. The equivalent of Format value is named Format tag field on macOS.

Another option would be to use Convert → Tag - Tag: just select COMMENT as field and use
Energy %comment%
as format string.