Tip on line 1531 is incorrect

The tip on line 1531 is incorrect because it is missing backslash characters before the parentheses and the backreference "1". In other words, it should be:
:%s#.(hours).#\1#
instead of
:%s#.(hours).#1#

[hobbestigrou]

Thanks for this. Please can you make the modification ? Sorry for the time of my answer.