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\d{3,4}\-\d{6,8} 此处破折号为啥要转义？

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心有灵犀的小欣

#1 Created at ... [Delete] [Delete and Lock User]

- 英文的破折号不是特殊字符，为啥要转义

lm0077

#2 Created at ... [Delete] [Delete and Lock User]

我也有同样的疑问

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