const lines = [
  `h=h.replace(/(\\\\/\\\\/[^\\\\n]*)/g,'');`,
  `h=h.replace(/(#[^\\\\n]*)/g,'');`,
  `h=h.replace(/(\\\\/\\\\*[\\\\s\\\\S]*?\\\\*\\\\/)/g,'');`,
];
for(let line of lines) {
  try {
    eval(line);
    console.log("OK:", line);
  } catch(e) {
    console.log("ERROR:", e.message, "ON", line);
  }
}