benchmark, libs: remove needless RegExp capturing
Checklist
-
make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines
Affected core subsystem(s)
benchmark, readline, repl, url, util
Use non-capturing grouping or remove capturing completely when:
- capturing is useless per se, e.g. in test() check;
- captured groups are not used afterward at all;
- some of the later captured groups are not used afterward.