Multi line search and replace tool [closed]

Answer 1

I'm not allowed to comment, but the accepted solution cites an example that seems broken. Line 18 should be:

s,[/\.*[],\\&,g

Not

s,[/\[.*],\\&,g

The latter will complain with modern sed (or 'gsed' if you're in *BSD) about an unterminated expression on line 18.