Last modified: 2011-10-05 17:58:58 UTC
The search result of "ICカード" shows "いわさききicカード"(there are a pair of a non-Latin character "き"-/ki/-). In fact, there are no article named "いわさききicカード"(two "き"-/ki/- characters), but "いわさきicカード"(one "き"-/ki/- character). * search result http://ja.wikipedia.org/w/index.php?title=%E7%89%B9%E5%88%A5%3A%E6%A4%9C%E7%B4%A2&search=IC%E3%82%AB%E3%83%BC%E3%83%89&ns0=1&ns4=1&ns5=1&ns14=1&ns15=1&ns100=1&ns101=1&fulltext=%E6%A4%9C%E7%B4%A2&uselang=en * "いわさききicカード" http://ja.wikipedia.org/w/index.php?title=%E3%81%84%E3%82%8F%E3%81%95%E3%81%8D%E3%81%8Dic%E3%82%AB%E3%83%BC%E3%83%89&uselang=en * "いわさきicカード" http://ja.wikipedia.org/w/index.php?title=%E3%81%84%E3%82%8F%E3%81%95%E3%81%8DIC%E3%82%AB%E3%83%BC%E3%83%89&uselang=en http://ja.wikipedia.org/wiki/%E3%81%84%E3%82%8F%E3%81%95%E3%81%8DIC%E3%82%AB%E3%83%BC%E3%83%89 I have other examples. In same search result, "カ" is duplicated at "icカカード", "ス" at "バススicカード", and "圏" at "首都圏圏icカード相互利用サービス".
Sorry, I forgot to say that this is a problem in Japanese Wikipedia.
Confirmed, this is a backend bug, turning off lucene highlighting for jawiki and zhwiki until resolved.