gistfile1.js

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Well the $ is expected. Mine is only supposed to match non-ascii unicode characters (it's the "slow" path). I'll check the others. Thanks :)

This has been on my todo list for a while. Addressing it atm.

My regex contains checks for alnum, which it really shouldn't. Reevaluating it after your comment made me realize that so I removed it (much like $ and _ shouldn't be part of it for me).

I understand that \xAA is shorter than \u00AA but I kind of like the consistency.

As for the missing letters; that's really unexpected for me. I got these ranges from a website I thought I could trust. So to see, for example, that I was skipping \x0527 and then to discover it's a CYRILLIC CAPITAL and part of Lu plain sucks.

I'm gonna update the regex to match yours. At least if that turns out to be a mistake I know who to hit (in the shoulder) :)

Cheerio

Actually, revisiting http://stackoverflow.com/questions/1661197/valid-characters-for-javascript-variable-names I see I need to have two regexes because I do need to special case the first character. I had forgotten that certain unicode groups are only valid as second+ char. I thought (/had remembered) the limitation only applied to numbers. Interestingly enough, I stumbled upon it because I was editing in 0x200d which rang too familiar a bell for me. That's when it dawned to me. Ok, I'll fix this later.