Regex to find date in format mm/dd/yyyy
mm/dd/yyyy
([\d]{1,2})/([\d]{1,2})/([\d]{4})
In Sublime Text Find and Replace (CMD+OPT+F) replace with $3-$1-$2
$3-$1-$2
This replaces date mm/dd/yyyy with yyyy-mm-dd
yyyy-mm-dd