Stackedit/res/extensions/emailConverter.js

define([
    "classes/Extension",
], function(Extension) {

    var emailConverter = new Extension("emailConverter", "Markdown Email", true);
    emailConverter.settingsBlock = '<p>Converts email adresses in the form &lt;email@example.com&gt; into clickable links.</p>';

    emailConverter.onPagedownConfigure = function(editor) {
        editor.getConverter().hooks.chain("postConversion", function(text) {
            return text.replace(/<(mailto\:)?([^\s>]+@[^\s>]+\.\S+?)>/g, function(match, mailto, email) {
                return '<a href="mailto:' + email + '">' + email + '</a>';
            });
        });
    };

    return emailConverter;
});