匹配换行
\r?\n|(?<!\n)\r
匹配空行
^\s*\n
匹配数字加点开头
^\d+\.
匹配选择题选项
[A|B|C|D]\.
December 17, 2025
Welcome常用正则表达式
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\r?\n|(?<!\n)\r
^\s*\n
^\d+\.
[A|B|C|D]\.
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Share it with your friends and colleagues!