^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$
有効な IP を表す正規表現
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Origin blog.csdn.net/LONG_Yi_1994/article/details/131372447
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