Usage of Regular Expression Extractor JMeter?

Using Regular Extractor in JMeter, I need to get the value of "fullBkupUNIXTime" from the below response,

{"fullBackupTimeString":["Mon 10 Apr 2017 14:14:36"],"fullBkupUNIXTime":["1491833676"],"fullBackupDirName":["10_04_2017_0636"]}

I tried with Ref Name as "time" and Regular Expression: "fullBkupUNIXTime": "([0-9])" and "(.+?)" and pass them as input for 2nd request ${time}

The above 2 two doesn't worked out for me...!

Please Help me out of this.....