这些都是IP

IP地址:

^((25[0-5]|2[0-4][0-9]|[01][0-9][0-9]|[0-9]{1,2})\.){3}(25[0-5]|2[0-4][0-9]|[01][0-9][0-9]|[0-9]{1,2})$

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转载自lht.iteye.com/blog/1284131