Issue on strings.TrimRight("about.html", ".html")

[subchen]

go 1.8.1
macos 10.12.4

I got abou, NOT about on following code

s := strings.TrimRight("about.html", ".html")
fmt.Print(s)

And I try other cases on strings.TrimRight(), they are all OK.

Why above case is failed? A bug?

[emidoots]

This isn't a bug. The Go issue tracker is also not for questions, please use the mailing list.

TrimRight returns a slice of the string s, with all trailing Unicode code points contained in cutset removed.

The cutset .html contains the letter t in the trailing part of the string, therefore the trailing t in about is removed. For example, see that strings.TrimRight("abouta.html", ".html") produces abouta -- that's because a is not in the trailing set.

For your case, you should be using TrimPrefix NOT TrimRight.

[subchen]

@slimsag, thanks for your explains. I should use TrimSuffix