Format Value with regexp from another field

Support
1

Suppose I have track names (TITLE) like this on one CD:

Tambourin (Rameau)
Courante (Lully)

What I'd like to do is extract the composer names (Rameau and Lully) and put them into the COMPOSER field, which is a custom field I've set up in my own tagging system geared toward classical music.

Of course, I can easily remove the composer from the TITLE field like this:

(.) ((.))$ ---> $1

But when creating a new action of "Format Value," I don't see any way to extract specific parts of the TITLE field and put it into the COMPOSER field.

2

COMPOSER is no custom field but a standard one.
An action of the type "Guess value" for
source: %title%
Pattern: %title% (%composer%)
might help you.

3

Or to edit your reg expression..

Format action.
Format: COMPOSER
With: $regexp(%composer%,.*(([^(]+))$,$1)