const str = 'test';
const dataSize = 5000;
const target = str + dataSize;
const obj = {};
for (let i = 0; i <= dataSize; i++) obj[str + i] = 1;
const arr = Object.keys(obj);
const regexp = new RegExp(`^(\\b${arr.join('\\b|\\b')}\\b)`, 'gi');
regexp.test(target);
obj.hasOwnProperty(target);
arr.includes(target);
regexp.test(str + 0);
obj.hasOwnProperty(str + 0);
arr.includes(str + 0);