在右边的黑板上写上正确的字。
我们愿意相信我们所做的选择是基于坚实的理由的。但右边的未必正确，也许左边的比较好？
We'd like to feel we make choices based on solid reasoning. But that's not necessarily right. Or is it left?
为了正确地在光标周围匹配左边和右边上下文，要确保该模式仅在光标所在的列进行匹配。
In order to correctly match left and right contexts around the cursor, it needs to ensure the pattern matches only at the cursor's column.
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