Add bracket around a string that match this pattern

Question

Using sed commands

In the following sentence add [] around words starting with s and containing e and t in any order “subtle exhibit asset sets tests site”.

Here is what I have so far (see code section)

$ echo "subtle exhibit asset sets tests site." | sed 's/^s\ "et"/[]/g'

Answer 1

Using GNU sed

$ sed 's/\<s\([a-z]*\?e[a-z]*\?t[a-z]*\?\|[a-z]*\?t[a-z]*\?e[a-z]*\?\)[^ ]*\>/[&]/g' input_file
[subtle] exhibit asset [sets] tests [site].