whileループの(条件)で変数を宣言してもええんやで

const regexp = RegExp('foo[a-z]*','g');
const str = 'table football, foosball';
let match;

while ((match = regexp.exec(str)) !== null) {
  console.log(`Found ${match[0]} start=${match.index} end=${regexp.lastIndex}.`);
  // expected output: "Found football start=6 end=14."
  // expected output: "Found foosball start=16 end=24."
}

でも、whileループの(条件)でvar let constは使えへん