strings.Contains() returns 始终为假

Question

在Go中，我想检查以下字符串是否包含字符串中的text/plain。函数 strings.Contains() returns 总是 false.

我本地的go版本是go1.14.3windows/amd64，我的服务器版本是go1.13.3linux/amd64

测试代码(play.golang.org/p/_ikCzWd6438)

var test = "text/plain; charset=utf-8"

fmt.Println("my string:", test)
fmt.Println("strings.Contains(text/plain)", strings.Contains("text/plain", test))
fmt.Println("strings.Contains(text)", strings.Contains("text", test))
fmt.Println("strings.Contains(charset)", strings.Contains("charset", test))

var test2 = strings.ReplaceAll(test, "/", "") // remove slash
fmt.Println("my second string:", test2)
fmt.Println("strings.Contains(textplain)", strings.Contains("textplain", test2))
fmt.Println("strings.Contains(text)", strings.Contains("text", test2))
fmt.Println("strings.Contains(charset)", strings.Contains("charset", test2))

输出

my string: text/plain; charset=utf-8
strings.Contains(text/plain) false
strings.Contains(text) false
strings.Contains(charset) false
my second string: textplain; charset=utf-8
strings.Contains(textplain) false
strings.Contains(text) false
strings.Contains(charset) false

那么为什么 returns strings.Contains() 总是 'false'？

Answer 1

根据the docs：

func Contains(s, substr string) bool

Contains reports whether substr is within s.

第一个参数s是原始字符串，第二个参数substr是您要搜索的子字符串。你的情况正好相反。

例如strings.Contains("charset", test)，应该是strings.Contains(test, "charset")

strings.Contains() returns 始终为假

strings.Contains() returns always false

string

compare

contains

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