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Changes between Version 2 and Version 3 of Ticket #37134, comment 20

v2	v3
2	2	- (minor) The filter is for a regex, not "chars", perhaps the filter name and the var name should mention that :)
3	3	- Allowing `(`, `)`, etc. can be done now, but it's still a potential security breach. Thinking there should be at least some more documentation on why these are not allowed by default, and what would be "safe" there.
4		- Perhaps instead of filtering/replacing the regex, the whole check can be done preemptively? Seems to make more sense if/when plugins want to use another method of checking for safe CSS.
	4	- Perhaps instead of filtering/replacing the regex, the whole check can be done preemptively? Seems to make more sense if/when plugins want to use another method of checking for safe CSS. This will also allow several plugins to run their checks instead of overriding one another.