You are right. It is just removal of the bracketed text. The input is multi-line string, so only flag used was the multi-line mode.

These are string lines I have encountered and how I wanted to change them:

1. "[...]"               -> ""
2. "-[...]"              -> ""
3. "-[...] text"         -> "-text"
4. "-text [...]"         -> "-text"
5. "[...] text [...]"    -> "text"
6. "-[...] text [...]"   -> "-text"

The main point is that I needed to remove the dash only if there is no other text on the line.

I have tried the regex you are suggesting at the beginning, but it failed at points (3) and (6).

EDIT: It just occurred to me that the first line of my comment sounds like stupid AI. 🤦