[cleaner] Improve IPV6 MAC address RE

[pafernanr]

• Improves 3766

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[packit-as-a-service]

Congratulations! One of the builds has completed. 🍾

You can install the built RPMs by following these steps:

• sudo yum install -y dnf-plugins-core on RHEL 8
• sudo dnf install -y dnf-plugins-core on Fedora
• dnf copr enable packit/sosreport-sos-4004
• And now you can install the packages.

Please note that the RPMs should be used only in a testing environment.

[pmoravec]

I guess we need to stick to some more specific patterns (like dont obfuscate link-local MAC addresses), but I see nice performance gains: running "in each line in each regular file of a sosreport, apply re.match()" benchmark on some example bigger sosreport, I see that:

IPV6_REG_8HEX is improved from 0m19.023s runtime to 0m16.499s runtime

IPV6_REG_4HEX is improved from 0m17.840s to 0m16.545s.

IPV4_REG s improved from 0m19.275sto0m16.506s`.

The times include os.walk and file.read() - just those I/O operations alone take 5 seconds. So the improvement is from 14s to 11.5s (IPV6_REG_8HEX), from 12.8s to 11.5s (IPV6_REG_4HEX) and 14.2s to 11.5s (IPV4_REG).

Those figures are worth of an attempt to simplify the REs.