PHP中的正则表达式

Question

$ereg = "([a-zA-Z0-9_\-]+)@([a-zA-Z0-9_\-]+\ . [a-zA-Z0-9\-\ . _\]+)";

//邮箱检测的正则表达式，

//每个0-9后面的  _ / -  是什么意思？

Answer 1

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

Answer 2

_\-: 表示字符集里面包括下划线和中划线。