What does `^.Gallus|Homo|Bos.$` mean?

Authors:

^.*Gallus|Homo|Bos.*$ is a regular expression that matches a string containing the words Gallus OR Homo OR Bos.

Resource PURL: https://gxy.io/GTN:F00383

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What does `^.*Gallus|Homo|Bos.*$` mean?