How to replace paired square brackets with other syntax with sed?

Question

I want to replace all pairs of square brackets in a file, e.g., [some text], with \\macro{some text}, e.g.:

This is some [text].
Th         


        

Answer 1

The following expression matches the pattern [a-z, A-Z and space] and replaces it with \macro{}

sed -e 's/\[\([a-zA-Z ]*\)\]/\\macro{\1}/g'

In the expression the \( ... \) form a match group that can be referenced later in the substitution as \1