FEATURE: Check watched regular expressions in v8 (PR #13157)

JavaScript does a better job at checking the validity of regular expressions.

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This is slightly scary to me because it will eval any code passed in as a string. I don’t think there’s any easy way to validate that the string is a regexp, but one idea I had was to pass the regexp itself from admin_dashboard_data, then have this method call .source on it. That way if any evil code in our codebase wants to eval, it’ll need to pass an object that has a .source method.

I think the .inspect will cover all the unsafe cases. Anyway, @ZogStriP proposed we move this check to the client side and I did that in pull request 13164. I am closing this one.