emoticon confused with RT

[chenhaot]

for instance, pls RT__Tell will be parsed to pls R T__T ell

I have an ad-hoc fix for now. It seems OK to me.

[brendano]

Hm. Do you have other examples? Is it always with the double underscore?

Please send us a pull request with your fix if you can. To test a fix to the tokenizer, what we do is run the old and new version on 100,000 tweets, then look at the differences if any.