I like to keep my symbol value pairs aligned, like this:
# CoffeeScript root: key1: 1 otherKey: 'value'
To do that, I'd select the lines, then do
C-u M-x align-regexp, use
:\(\s-*\) as the regexp, hit
<RET> a couple of times, then
n. It turns out there is a much easier way. Add the following to your Emacs config:
(add-hook 'align-load-hook (lambda () (add-to-list 'align-rules-list '(symbol-value-alignment (regexp . ":\\(\\s-*\\)") (group . 1) (modes . '(ruby-mode coffee-mode)) (repeat . nil)))))
Then, select the lines you want to align, and simply do
M-x align (or even better, bind that to a key combination).
Emacs' alignment facilities are really powerful. To learn more, see http://emacswiki.org/emacs/AlignCommands