spoj_normalize_title.js

// normalizeTitle :: String -> String
const normalizeTitle = rawTitle => {
  const parts = rawTitle.split(" - ");
  const right = parts[1].toLowerCase().replace(/\s/g, "_").replace(/[^a-z_0-9]+/g, "");
  
  return `${parts[0]}-${right}`;
}

const rawTitle = document.getElementById("problem-name").innerHTML;

normalizeTitle(rawTitle);

// Example
// input: EASYPROB - A Very Easy Problem!
// output: EASYPROB-a_very_easy_problem

// Useful for getting a name that can be used in a code file.