How to find the word between..?

Question

bash

Help me to understand.
How to search inside a text file, you need to find this expression: CDIQAA
"nextPageToken": "CDIQAA",
Tried to use like this, does not fit

a="\"nextPageToken\": \"CDIQAA\","
echo "$a" | grep -o '"[^"]*"'

Answer 1

emnip, grep shows the string containing the search.
if you need a specific piece of string, then awk is the way to go.

Answer 2

If I understand correctly, then

a="\"nextPageToken\": \"CDIQAA\","
echo "$a" | grep -oP '(?<=nextPageToken": ")[^"]+?(?=")'

finds the token