regex to remove all formatting

I'm looking for a regex to remove everything except letters from a string.

E.g. "Marys Page ...." should b开发者_如何学JAVAecome "MarysPage"

---

The one that would be passed to tools like perl/sed/etc would be: s/[^a-zA-Z]//g

---

You can replace [^a-zA-Z] with "".