A few of them are almost certainly shortcomings in Ostrich, while others seem to intend to match literal full strings, like ^(로그인하지 않고)$ ("without logging in"). Presumably they're from internal use.
Оказавшиеся в Дубае российские звезды рассказали об обстановке в городе14:52，这一点在搜狗输入法2026中也有详细论述
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The returned value will then have bool or iter called upon