It would take me a bit to figure that out with a regex, but you can use this:
var str = '';
chars = str.split("");
for (var i = 0; i < chars.length; i++) {
if (chars[i] === '<' || chars[i] === '/') {
chars[i + 1] = chars[i + 1].toUpperCase();
}
}
str = chars.join("");
jsFiddle
I hope it helps.