(?i) not works properly

[tengattack]

onig_search failed to match such pattern:

pattern: (?i) *(TOOKY)[ _\-]([^;/]+) ?(?:Build|;)
cannot match Mozilla/5.0 (Linux; Android 4.0.3; TOOKY A9PLUS Build/IML74K) AppleWebKit/535.19 (KHTML, like Gecko) Chrome/18.0.1025.166 Mobile Safari/535.19
but can match Mozilla/5.0 (Linux; U; Android 2.3.4; Zh-tw; TOOKY A9 Build/GRJ22) AppleWebKit/533.1 (KHTML, Like Gecko) Version/4.0 Mobile Safari/533.1

[tengattack]

BTW, I'm using ONIG_ENCODING_UTF8 which caused this problem, and if I change to ONIG_ENCODING_ASCII there is no problem.

[K.Takata]

I found that #113 was broken. I will make a fix.