How to redirect grep output to a variable?

Question

I have some pipe. For example, I have this pipe:

user@user:~$ cal | head -1 | grep -oP \"[A-Za-z]+\"

For this pipe I get this result:

Answer 1

 month=$(cal | head -1 | grep -oP "[A-Za-z]+")

or

 month=$(date +%B)