process.stdin.resume();
process.stdin.setEncoding('utf8');
// your code goes here
function testar(palavra, frase) {
const regex = new RegExp(`(?<!\\p{L})${palavra}(?!\\p{L})`, 'iug');
// troca a palavra por X, para vermos se pegou as ocorrências corretas
console.log(frase.replace(regex, 'X'));
}
testar('água', 'tem Água nas águas, deságua');
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