[basemntunivrse]

This is really cool, nice idea!

Also, the following script might help to make the game more accessible (or to help you cheat :P) -

  // note: game doesn't seem to automatically clear at the end, so in the dev console use:
  // window.localStorage.clear();
  // then refresh the page

  const prime = n => {
    for (let i = 2, s = Math.sqrt(n); i <= s; i++) {
      if (n % i === 0) {
        return false;
      }
    }
    return n > 1;
  }
  const generateNums = digits => (
    m => [...Array(9 * m).keys()].map(i => i + m)
  )(Math.pow(10, digits - 1));
  const generate5DigitPrimes = () => generateNums(5).filter(prime);

  const all5DigitPrimes = generate5DigitPrimes();

  // updated to take an optional array (defaults to all5DigitPrimes)
  // this means you can chain the check function to do things that normal regex can't do
  // e.g. check(/some_regex/, check(/some_other_regex/))
  const check = (r, a = all5DigitPrimes) => a.filter(p => r.test('' + p));

Usage:

paste the above code into the dev console

type 'all5DigitPrimes' and press Enter to see a list of all 5-digit primes

type 'check(/some_regular_expression/)' to see a filtered list of primes that match your regular expression

[scythe]

I also cheated with a script, leading to this:

https://pastebin.com/sQtekXCW