twitter/twitter-text-java — pull request #25 by kscanne (2012-02-10 03:16:11+00:00)
Title: Add latin characters to regex for autolinking hashtags

This patch adds Latin characters needed for hashtags in several languages with large, active Twitter communities, notably Vietnamese, Romanian, Polish, Czech, Croatian, and Turkish. The only tricky thing was how to handle the "IPA Extensions" Unicode block; I chose not to add all of the letter characters from this block since the majority are only used for linguistic transcription - a handful of characters, however, are used in standard written alphabets in Africa, e.g. ɓ, ɗ in Hausa (~40 million speakers), ɔ and ɛ Akan (national language in Ghana) and Lingala; 12 in all.