type SitemapPriority = `${'0.1'|'0.2'|'0.3'|'0.4'|'0.5'|'0.6'|'0.7'|'0.8'|'0.9'|'1.0'}`; let priority: SitemapPriority = '0.1'; // valid let priority: SitemapPriority = '0.10'; // invalidlet regex: RegEx = /bc*d/;const regex_alphanumeric = /^[a-zA-Z\d]*$/; console.log(regex_alphanumeric.test('a')); console.log(regex_alphanumeric.test('1')); console.log(regex_alphanumeric.test('!'));type MarkerTime =`${number| ''}${number}:${number}${number}` let a: MarkerTime = "0-00" // error let b: MarkerTime = "0:00" // ok let c: MarkerTime = "09:00" // ok