You should probably copy Twitter's own twitter-text library. Their regex
is a bit more complicated, and in Ruby, an I am not proficient enough in
Python to push a real patch:
LATIN_ACCENTS = [(0xc0..0xd6).to_a, (0xd8..0xf6).to_a,
(0xf8..0xff).to_a].flatten.pack('U*').freeze
HASHTAG_CHARACTERS = /[a-z0-9_#{LATIN_ACCENTS}]/io
However, HASHTAG_CHARACTERS are only allowed from position 2 and on:
REGEXEN[:auto_link_hashtags] =
/(^|[^0-9A-Z&\/]+)(#|＃)([0-9A-Z_]*[A-Z_]+#{HASHTAG_CHARACTERS}*)/io
--
non ASCII chars in hashtags dont work
https://bugs.launchpad.net/bugs/372164
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