isThai

let m;

const isThai = (str) => {
  const regexThai = /([\u0E00-\u0E7F]+)/gmu;
  const found = str.match(regexThai);
  if (!found) return false;
  return true;
};

const str = `engภาษาไทยที่มีสระ123!@`;
const str2 = "asdSD";

console.log(isThai(str2));