查找:
(\w*)_(\w*)
(\w*)_(\w*)_(\w*)
替换:
\l$1\u$2
\l$1\u$2\u$3
查找:
(\w*)_(\w*)
(\w*)_(\w*)_(\w*)
替换:
\l$1\u$2
\l$1\u$2\u$3
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