You want expect_out(1,string)
-- that is the 1st captured group
expect_out(0,string)
contains the portion of the text that matches the regex
$ expect
expect1.1> spawn sh -c {echo '1/ 5 SOMETEXT Active'}
spawn sh -c echo '1/ 5 SOMETEXT Active'
4093
expect1.2> expect -re {1/\s+(\d+)\s+SOMETEXT\s+Active}
1/ 5 SOMETEXT Active
expect1.3> puts $expect_out(1,string)
5
expect1.4> puts $expect_out(0,string)
1/ 5 SOMETEXT Active