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