这个正则表达式为什么需要加号啊

Question

如果需要加号为什么不是\\w+@+\\w+\\.+\\w

Answer 1

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Answer 2

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Answer 3

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Answer 4

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Answer 5

你可以看这个方法入参，要求传入一个String类型所以需要""双引号括起来