regex with delimiters for getting value

Question

I need to get the value 20 as below:

this is expired time is (second) 20
max time in the system       1048576

My regex must return the value 20.

i have tried as below:

this is expired time is\s+(\d+)

Any help will be greatly appreciated

Answer 1

^this is expired time is \(second\) (\d+)