[匹配大小写替换]使用正则，在无视大小写的情况下，匹配字符串 A 并替换为 B，同时又希望 B 的大小写与 A 保持一致 #string

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[匹配大小写替换]使用正则，在无视大小写的情况下，匹配字符串 A 并替换为 B，同时又希望 B 的大小写与 A 保持一致 #string

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Last edited Jan 25, 2019

Created on Jan 22, 2019

This example demonstrates how to use Python’s `re.sub` with a callback function to replace a string while preserving the original capitalization style. The `matchcase` function returns a replacement function that checks the matched text’s case—all uppercase, all lowercase, or capitalized—and applies the corresponding case to the replacement word. The code shows two calls with `flags=re.IGNORECASE`, where 'Python' becomes 'Snake' and 'PYTHON' becomes 'SNAKE', using the `re` module’s substitution API.

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