Regular Expression Expansion
Actual search is performed by
Regular Expression Engine
But you don't have to care about it
   k
         [kＫｋかきくけこっカキクケコッヵヶΚ哀愛旭扱絢袷暗闇鞍杏位
         囲惟易畏異衣一溢因蔭陰隠烏窺臼渦嘘雲影越閲煙汚凹応...
   ki
         [きキヶ衣窺汚黄乙牙階肝岸企伎危喜器基奇嬉寄岐希幾忌揮
         机旗既期棋棄機帰毅気汽畿祈季稀紀徽規記貴起軌輝飢騎...
   kik
         [掬菊鞠樵效椈鞫]|kik|ｋｉｋ|き[かきくけこっ]|キ[カキクケコッ]|窺
         基|企[画劃]|危[機急険]|喜([々界気国]|歌劇|久[子治泉男雄])|...

The regular expressions are generated by dictionaries and rules.