A regex pattern that worked in 5.8 will also work in 5.10. What did you have in 5.8?
Well, that will continue to work in 5.10. If you wanted to use named captures,
PS — Make sure to test your code with the following string:
"Test Tester Testing [Feb 18: 28_10_10] Tests"
It shouldn't match ("Test" ne "Tests"), but it's easy to match it if the pattern isn't properly anchored.