May want to out a warning on this tool that if your checking against a long list of strings you may want to use something else. A massive regex can be a huge performance bottleneck. I know from personally killing a production server by using an inefficient regex on large strings of data.

Here is an example. Given the following list of strings:

1.2.3.4
127.0.0.1
127.0.0.2
127.0.0.11
128.0.0.1
125.0.0.*
200.0.0.1
2001:0db8:85a3:0000:0000:8a2e:0370:1300
2001:0db8:85a3:0000:0000:8a2e:0370:1330
2001:0db8:85a3:0000:0000:8a2e:0370:1337
あいうえお
あいうえこ
😃😁😆😐
😃😁😆
😃😁🤣

list2regexp will return the following pattern:

^(?:1(?:(?:\.(?:2(?:\.(?:3(?:\.(?:4))))))|(?:2(?:(?:5(?:\.(?:0(?:\.(?:0(?:\.(?:.*)))))))|(?:7(?:\.(?:0(?:\.(?:0(?:\.(?:(?:1(?:|(?:1)))|(?:2))))))))|(?:8(?:\.(?:0(?:\.(?:0(?:\.(?:1)))))))))))|(?:2(?:0(?:0(?:(?:\.(?:0(?:\.(?:0(?:\.(?:1))))))|(?:1(?::(?:0(?:d(?:b(?:8(?::(?:8(?:5(?:a(?:3(?::(?:0(?:0(?:0(?:0(?::(?:0(?:0(?:0(?:0(?::(?:8(?:a(?:2(?:e(?::(?:0(?:3(?:7(?:0(?::(?:1(?:3(?:(?:0(?:0))|(?:3(?:(?:0|7))))))))))))))))))))))))))))))))))))))))))|(?:あ(?:い(?:う(?:え(?:(?:お|こ))))))|(?:😃(?:😁(?:(?:😆(?:|(?:😐)))|(?:🤣))))$