How to remove markdown links from headers with sed?

I'm trying to use sed to remove links like and leave just the title:

## [Some title](#some-title)

This is my command:

sed 's/^\(\#*\) *\[\([^\]]*\)\].*/\1 \2/'

I expect to have just the text without the link:

## Some title

But it doesn't work. What I do wrong? I'm using Linux with GNU sed.