[Question] Why are regexes not conform w3c specs?

[SalesFeed]

It looks like validators are not very exact, false positivies can occur in classnames.

e.g: is producing a false result, I know it's an invalid classname, but it's a jungle out there. It should at least produce a selector without considering '1-8'

[gmmorris]

Hi, If there is a specific case you feel in invalid, please provide exact examples so that.

I will try to prioritise time to address actual false positives, but can't prioritise investigation time without concrete issues.

Thanks