MatchTheRegex

100 points

AUTHOR: SUNDAY JACOB NWANYIM

Description How about trying to match a regular expression The website is running here.

Note: This challenge launches an instance on demand.

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Looking inside the script tag we can see:

<script>
  function send_request() {
    let val = document.getElementById("name").value;
    // ^p.....F!?
    fetch(`/flag?input=${val}`)
      .then((res) => res.text())
      .then((res) => {
        const res_json = JSON.parse(res);
        alert(res_json.flag);
        return false;
      });
    return false;
  }
</script>

The regex is supposed to be ^p.....F!?, literally the first and only guess was picoCTF, when I entered it gave the flag:

picoCTF{your flag}