Regex to Indent an XML File

Question

Is it possible to write a REGEX (search replace) that when run on an XML string will output that XML string indented nicely?

If so whats the REGEX :)

Answer 1

Doing this would be far, far simpler if you didn't use a regex. In fact I'm not even sure it's possible with regex.

Most languages have XML libraries that would make this task very simple. What language are you using?