在Go中分割字符串

Question

How do I get the slices before and after a separator from a string? In Python, I can simply write

user, _, domain = "[e-mail]".partition("@")
assert user == "foo"
assert domain == "example.com"

Notably, this also works if multiple occurrences of the separator are present in the input, or none at all. How can I split a string that easily in Go?

Answer 1

You can use this helper function which wraps SplitN:

import "strings"

func Partition(s string, sep string) (string, string, string) {
    parts := strings.SplitN(s, sep, 2)
    if len(parts) == 1 {
        return parts[0], "", ""
    }
    return parts[0], sep, parts[1]
}