Drop unneeded regex

[ktf]

This pollutes a bunch of compile units with unneeded code for creating and handling
the regex.

[github-actions]

REQUEST FOR PRODUCTION RELEASES:
To request your PR to be included in production software, please add the corresponding labels called "async-" to your PR. Add the labels directly (if you have the permissions) or add a comment of the form (note that labels are separated by a ",")

+async-label <label1>, <label2>, !<label3> ...

This will add <label1> and <label2> and removes <label3>.

The following labels are available
async-2023-pbpb-apass4
async-2023-pp-apass4
async-2024-pp-apass1
async-2022-pp-apass7
async-2024-pp-cpass0
async-2024-PbPb-apass1
async-2024-ppRef-apass1

[ktf]

This gets scattered on a gazillion of places and actually significantly affects O2 compilation.

[alibuild]

Error while checking build/O2/fullCI for d35d38c at 2025-01-10 15:27:

## sw/BUILD/O2-latest/log
c++: error: unrecognized command-line option '--rtlib=compiler-rt'
c++: error: unrecognized command-line option '--rtlib=compiler-rt'
input_line_9:1051:14: error: no template named 'bitset' in namespace 'std'
input_line_9:1056:14: error: no template named 'bitset' in namespace 'std'
input_line_9:1061:14: error: no template named 'bitset' in namespace 'std'
input_line_9:1085:19: error: no member named 'bitset' in namespace 'std'
input_line_9:1085:36: error: expected member name or ';' after declaration specifiers
input_line_9:1086:8: error: no template named 'bitset' in namespace 'std'
input_line_9:1089:8: error: no template named 'bitset' in namespace 'std'
input_line_9:1090:8: error: no template named 'bitset' in namespace 'std'
input_line_9:1093:8: error: no template named 'bitset' in namespace 'std'
input_line_9:1094:8: error: no template named 'bitset' in namespace 'std'
Error: /sw/slc8_x86-64/ROOT/v6-32-06-alice1-27/bin/rootcling: compilation failure (/sw/BUILD/0c84f7b5b820902deb0711a61850bf5700585125/O2/Detectors/ZDC/calib/G__O2ZDCCalib09a588d870_dictUmbrella.h)
ninja: build stopped: subcommand failed.

Full log here.

[ktf]

For the record, this resulted in 350 MB (yes 1 000 000 bytes) smaller installation size, AFAICT. More changes could have affected that as well, actually.