Is there a smarter way to keep the indentation when replacing characters with a regex?

I want to replace the asterisks in a Markdown list with hyphens.

Example:

• 1.0
  • 1.1
  • 1.2
• 2
  • 2.1
    • 2.2

Currently I have a separate regex pattern for up to three levels of indentation set up in Keyboard Maestro for Mac:

I wonder if there isn't a smarter way to do this and which adresses all kinds of indentation.

You can use submatching groups and reference them in the replacing string like this:

Regular expression matching your lines with list items: ([\t ]*)\*(.*)

The string used for replacement: \1-\2