How to perform a tag > tag conversion using only part of the info in the source field

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.

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.

Perfect! That got it!

I really appreciate your help--again!