That's not quite right, the * makes it match even if there's 0 C's, turning all colons into apostrophes, not just the intended ones

s/(^|[^C]):/$1'/g
[download]

fixes that, but won't work if there is multiple colons in a row. A negative lookbehind is probably the only way to do this properly.

--MrNobo1024
s]]HrLfbfe|EbBibmv]e|s}w}ciZx^RYhL}e^print