JSFiddle - React, Tailwind, and code Playground
HTML
<span class="mailme">some AT email DOT com</span>
<span class="mailme">some AT email DOT com</span>
JavaScript
if ($$("span.mailme").length){
var at = / AT /;
var dot = / DOT /g;
$$('span.mailme').each(function(el){
var addr = el.get('text').replace(at, '@').replace(dot, '.');
new Element('a', {
href: 'mailto:'+ addr,
html: addr
}).inject(el, 'after');
el.destroy();
});
}