英文:
Retrieve first directory in URL-like string in Go
问题
我正在尝试获取类似URL的字符串中的第一个目录，例如"/blog/:year/:daynum/:postname"。我以为将其拆分，然后获取第一个目录会很简单。但是，即使它不是一个切片，它返回了方括号括住的字符串。我该如何获取第一个目录？（我保证字符串以"/"开头，后跟有效的目录指定，并且包含使用这些永久链接属性的前导目录和字符串）。
解析出第一个目录的最佳方法是什么？
package main
import (
"fmt"
"strings"
)
// 获取URL-like字符串中的第一个目录
func firstDir(permalink string) string {
split := strings.Split(permalink, "/")
return string(fmt.Sprint((split[0:2])))
}
func main() {
permalink := "/blog/:year/:daynum/:postname"
dir := firstDir(permalink)
fmt.Printf("leading dir is: %s.", dir)
// 输出的结果不是"blog"，而是"[ blog]"。
}
英文:
I am trying to obtain the first directory in an URL-like string like this: "/blog/:year/:daynum/:postname". I thought splitting it, then retrieving the first directory, would be this simple. But it returns square brackets surrounding the string even though it's not a slice. How can I get that first directory? (I am guaranteed that the string starts with a "/" followed by a valid directory designation and that contains both a leading directory and a string using those permalink properties).
What's the best way to parse out that first directory?
package main
import (
"fmt"
"strings"
)
// Retrieve the first directory in the URL-like
// string passed in
func firstDir(permalink string) string {
split := strings.Split(permalink, "/")
return string(fmt.Sprint((split[0:2])))
}
func main() {
permalink := "/blog/:year/:daynum/:postname"
dir := firstDir(permalink)
fmt.Printf("leading dir is: %s.", dir)
// Prints NOT "blog" but "[ blog]".
}
答案1
得分: 2
由于您提到：“（我保证字符串以“/”开头，后跟有效的目录指定，并且包含使用这些永久链接属性的前导目录和字符串）”
那么只需使用split[1]来获取根目录。
package main
import (
"fmt"
"os"
"strings"
)
func firstDir(permalink string) string {
split := strings.Split(permalink, string(os.PathSeparator))
return split[1]
}
func main() {
permalink := "/blog/:year/:daynum/:postname"
dir := firstDir(permalink)
fmt.Printf("leading dir is: %s.", dir)
// 输出 "blog"。
}
您可以在此链接中查看代码的运行结果：https://go.dev/play/p/hCHnrDIsWYE
英文:
Since you said:"(I am guaranteed that the string starts with a "/" followed by a valid directory designation and that contains both a leading directory and a string using those permalink properties)"
Then simply use split[1] to get the root directory.
package main
import (
"fmt"
"os"
"strings"
)
func firstDir(permalink string) string {
split := strings.Split(permalink, string(os.PathSeparator))
return split[1]
}
func main() {
permalink := "/blog/:year/:daynum/:postname"
dir := firstDir(permalink)
fmt.Printf("leading dir is: %s.", dir)
// Prints "blog".
}
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