By using db<>fiddle, you agree to license everything you submit by Creative Commons CC0. 3799232 fiddles created (41700 in the last week).
with t as (select '"http://www.google.com/search","XYZ","Some other Value","false","false","2017-12-13"' myvalue from dual)
select regexp_replace(myvalue, '^.*"([^"]+)"$', '\1') mydate from t
