[Enhancement] Support for regex filters

[ktnjared]

To help fine-tune filtering and reduce clutter by accomidating for things like plurals, leetspeak, shorthand, and other variations.

Example

string: (?i)\bm(icro)?(\$(.*\b)?|soft[[:alnum:]]{1,}|shaft.*\b|sludge\b) (Regex101 sample)

It would allow:

• MS
• Microsoft
• microsoft
• Microsoft's

While filtering the following patterns

		Microsofties	Microshafted	Microsludge
M$	Micro$oft	Micro$ofties	Micro$hafted	Micro$ludge	M$ Office
m$	micro$oft	micro$ofties	micro$hafted	micro$ludge	m$office

Futher regex string examples can be found at https://urre.github.io/mutebot/.

[IdreesInc]

While the most recent version doesn't add regex support, it does improve content parsing so a muted word like "test" will apply to "Test", "Test's", "'Test'", etc. which should hopefully help in the meantime!