Grep a string inside double quotes

How to grep a string inside double quotes using Perl syntax (-Po)

$ cat aaaa
foo"bar"base
$ grep -Po '"\K[^"\047]+(?=["\047])' aaaa
bar
I use look around advanced regex techniques.

If you want the quotes too :

$ grep -Eo '["\047].*["\047]'
"bar"
Note :

\047
is the octal ascii representation of the single quote