Javascript

let isIpv4Valid = ipStr.match('/^((25[0-5]|2[0-4][0-9]|[10]?[0-9]?[0-9])(.|$)){4}/ig')

let isIpv4Valid = ipStr.match('/((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)(.|$)){4}/ig')

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