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String pattern = "^(([01]?([0-9][0-9]?)|2[0-4][0-9]|25[0-5]?)\.){3}([01]?([0-9][0-9]?)|2[0-4][0-9]|25[0-5]?)$";
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Java Regex
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String pattern = "^(([01]?([0-9][0-9]?)|2[0-4][0-9]|25[0-5]?)\.){3}([01]?([0-9][0-9]?)|2[0-4][0-9]|25[0-5]?)$";