WordPress/WordPress — pull request #48 by yonas (2013-09-13 07:18:50+00:00)
Title: Fix regular expression used for smiley translations to work when there is only one registered emoticon.

Without this patch, the string ":) :) :) :)" will not be replaced with four smilies when ":)" is the only emoticon in $wpsmiliestrans from smilies_init(), wp-includes/functions.php.