[moderator-words] support regular expressions for filters

[dims]

• use regular expressions so we can do complex matching going forward
• start by case insensitive look up for the first filter (so we would catch mixed case - say "Guys")

Signed-off-by: Davanum Srinivas davanum@gmail.com

[k8s-ci-robot]

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[dims]

tested the bits in go playground https://go.dev/play/p/qeBBCc6QOKI

[dims]

/assign @BenTheElder @jberkus

[dims]

closing this for now, we can revive if needed.

[jberkus]

Yeah, I have some concerns about cost, given that this runs for every post on Slack.