JAVASCRIPT

tolowercase

const sentence = 'The quick brown fox jumps over the lazy dog.';

console.log(sentence.toLowerCase());
// expected output: "the quick brown fox jumps over the lazy dog."

lowercase

/[A-Z]/  : 'must contain one uppercase'

/([a-z])/  : 'must contain one lowercase'

/(d)/  : 'must contain one number'

/(W)/  : 'must contain one special character'