Hello, Antonio,
If you are sure that the last colon, of each line of your file, is the exact location which separates the two parts, of each line, to be reversed , an other formulation could be :
SEARCH : (?-s)^(.+):(.+)
REPLACE : \2: \1 ( with a space between the colon : and the back-reference \1)
Notes :
The (?-s) first part ensures that the dot special character ( . ) represents a single standard character and not any End of Line character
Then the part (.+):, look, from beginning of line ( ^ ), for the longest non-empty range of standard characters, followed by the last colon of each line, which is stored as group 1, due to round brackets
Finally, the part (.+), grabs all the remaining standard characters of the current line ( = all text after the last colon character ) and stores them in group 2
Best Regards,
guy038