I am trying to search for a variation of a string in large bodies of text. The string is IPv6, which is presented in many different ways (i.e. ipv6, IPv6, IPV6, ip v6, IP v6, IP V6...etc). What is a better way to search for this than: 
$string =~ m/ipv6|IPv6|ip v6|IP v6| IP V6/ ...etc

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In reply to RegEx help by ewhitt

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