<script>
    let bio = "The coolest company to work for is @github!  There is also @aws and @microsoft.";
    let linkedBio = "";
    let found = false;
    let link = "";
    for (let i = 0; i < bio.length; i++) {
      let currentChar = bio[i];

      if (currentChar.startsWith("@")) {
        link += currentChar;
        found = true;
        continue // we don't need to look at other chars until next iterations
      }

      if (found) {
        if (/[^A-Za-z0-9]/.test(currentChar)) { // we found the end of the link (you can add more special chars to this)
          let tag = "<a href=https://github.com/" + link.substr(1) + ">" + link + "</a>"
          linkedBio += tag + currentChar // we add the special char at the end of the tag so that it actually appears, otherwise it does not
          link = "";
          found = false;
        } else {
          link += currentChar;
        }
      } else {
        linkedBio += currentChar;
      }
    }

    if (link.length > 0) { // means we need to add a link that is the last possible thing without anything after it
      let tag = "<a href=https://github.com/" + link.substr(1) + ">" + link + "</a>"
      linkedBio += tag
    }

    document.getElementById("bio").innerHTML = linkedBio
  </script>

<script>
    let bio = "The coolest company to work for is @github!  There is also @aws and @microsoft.";
    let linkedBio = bio.replace(new RegExp("(?:@)(\\w+)", "g"), "<a href='https://github.com/$1'>@$1</a>");
    document.getElementById("bio").innerHTML = linkedBio;
</script>