It feels like we have known each other all along.; to regret not having met earlier (idiom); It is nice to meet you finally.
恨：遗憾。为相见太晚而遗憾。形容一见如故，意气相投。也作“相知恨晚”。
主谓式；作定语；含褒义
只恨相见得太晚。形容一见如故，意气极其相投。
《史记·平津侯主父列传》：“天子召见三人，谓曰：‘公等皆安在？何相见之晚也。’”
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