Why isn’t this sed command working for the regex?

I want to remove the multi-line comments in Java using sed command. The regex is working if we use character ranges like a-zA-Z0-9 etc. but not in case of word character like wS.

Test-File content:

hello world
/* abcd
efgh*/
world hello

Command used :

sed -i -e  "s//*[sS]*///" <file>

Expected results:

hello world
world hello

Actual results:

hello world
 abcd
efgh*/
world hello

Answer

You can use grep with a regex (-E) and inverted matches (-v), i.e.:

grep -Ev '(/*|*/)' < text.txt

Output:

hello world
world hello