通过strsplit用非贪婪的正则表达式分割字符串

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I am facing a problem with regex and strsplit. I would like to split the following x string based on the second : symbol

x <- "26/11/19, 22:16 - Super Mario: It's a me: Super Mario!, but also : the princess"

然后获得像这样的东西

"26/11/19, 22:16 - Super Mario"
" It's a me: Super Mario!, but also : the princess"

I am using by using strsplit with the following regular expression that in based on my little know-how should reason like "select ONLY the colon symbol followed by a space and preceded by ONLY letters".

I tried to make the regex non greedy with the ? symbol but clearly I am missing something and the result does not work as expected because it includes also me: in the splitting operation.

It is essential I think to have a non greedy operator, because the string here is just an example I do not have always the word Mario of course.

strsplit(x, "(?<=[[:alpha:]]):(?= )", perl = TRUE)

先感谢您！