Adds mailto: prefix to email links within a filter.

add-mailto-link.js

// Add mailto: email links within .main
$(".main").filter(function() {
  var html = $(this).html();
  var emailPattern = /[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}/;
  var matched_str = $(this).html().match(emailPattern);
  if (matched_str) {
    $(this).html(html.replace(emailPattern, "<a href='mailto:" + matched_str + "'>" + matched_str + "</a>"));
    return $(this);
  }
});