Once you written a text to someone you are able to edit it. This can now be performed with regular expressions such as:
Send: hello world
Send: s/world/friend/g<p>Text is then changed from "hello world" to "hello friend" automatically.<p>Not sure if this is completely new or documented. But really nice feature!<p>(Work on Skype 7.26 on OSX)
Appears to have been around a while.<a href="http://blog.nyaruka.com/skypes-crazy-regex-easter-egg" rel="nofollow">http://blog.nyaruka.com/skypes-crazy-regex-easter-egg</a><p>Still very cool.