* Add Korean character ranges to exist CJK pattern
* Add constant for CJK hashtags
Becuase most of keywords in CJK are two characters
* Add CJK ranges to hashtag pattern to handle it.
* Fixes hashtag pattern to apply numbers at last
* Remove a wrong test case
`test_` shouldn't be a hashtag
* Fix hashtag regex to support standard unicodes
* Remove wrong escapes from regex