Forcing class text to be a keyword

[amadeus]

This class regex will match if the text class is contained within a larger variable name, and therefore is broken.

I.E. In a definition for className, class will match as jsClassDefinition which is bad.

This P.R. fixes that by forcing class to be a keyword.

[amadeus]

This is a pretty bad bug and the fix is pretty simplistic. Any concerns against merging this? Would like to get it in, ASAP.

[bounceme]

I am fine with it, maybe specify whitespace instead of word boundaries though, i don't really know the class syntax

[amadeus]

Unfortunately that isn't viable, since class{} is a valid class definition and don't want to break that.

[bounceme]

yeah, word boundary is enough then