Spring REST and e-mail as a parameter

UserController.java

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
public class UserController {

    @RequestMapping(value = "/users/{email:.+}", method = RequestMethod.GET)
    public @ResponseBody User getUserDetails(@PathVariable("email") String email) {
        //TODO
        return null;
    }

}