Function getSecondLevelDomain

Extracts the second-level domain (SLD) from a URL string.

getSecondLevelDomain('https://example.com/path?query=123'); // 'example'
getSecondLevelDomain('https://sub.example.co.uk/path?query=123'); // 'co'
getSecondLevelDomain('invalid-url'); // undefined
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