golang字符串常用的系统函数

1.统计字符串的长度，按字节len(str)

　　str := "hello北京" 　　fmt.Println("str len=", len(str))

2.字符串遍历，同时处理有中文的问题 r := []rune(str)

    str2 := "hello北京"     r := []rune(str2)     for i := 1; i < len(r); i++ {         fmt.Printf("字符=%c\n", r[i])     }

　　 n, err := strconv.Atoi("5656")     if err != nil{         fmt.Println("转换错误", err)     }else {         fmt.Println("转成的结果是", n)     }

4.整数转字符串 str = strconv.Itoa(12345)

    str = strconv.Itoa(123456)     fmt.Printf("str=%v, str=%T", str, str)

5.字符串转 []byte: var bytes = []byte("hello go")

    var bytes = []byte("hello go")     fmt.Printf("bytes=%v\n", bytes)

    str = string([]byte{97, 98, 99})     fmt.Printf("str=%v\n", str)

    str := strconv.FormatInt(123, 2)     fmt.Printf("123对应的二进制是=%v\n", str)     str = strconv.FormatInt(123, 16)     fmt.Printf("123对应的16进制是=%v\n", str)

8.查找子串是否在指定的字符串中：strings.Contains("seafood", "foo")

    b := strings.Contains("seafood", "abc")     fmt.Printf("b=%v\n", b)

9.统计一个字符串有几个指定的子串: strings.Count("ceheese", "e")

    num := strings.Count("ceheese", "e")     fmt.Printf("num=%v\n", num)

10.不区分大小写的字符串比较（==是区分字母大小写的）:fmt.Println(strings.EqualFold("abc", "Abc"))

    b = strings.EqualFold("abc", "Abc")     fmt.Printf("b=%v\n", b)

11.返回子串在字符串第一次出现的index值，如果没有返回-1：strings.Index("NLT_abc", "abc")

　　index = strings.Index("NLT_abcabcabc", "abc")　　fmt.Printf("index=%v\n", index)

12.返回子串在字符串最后一次出现的index，如果没有返回-1：strings.LastIndex("go golang", "go")

    index := strings.LastIndex("go golang", "go")     fmt.Printf("index=%v\n", index)

    str2 := "go go hello"     str := strings.Replace(str2, "go", "python", -1)     fmt.Printf("str=%v str2=%v\n", str, str2)

14.按照指定的某个字符，为分割标识，将一个字符串拆分成字符串数组，strings.Split("hello, wrold, ok", ",")

    strArr := strings.Split("hello,world,ok", ",")     for i := 0; i < len(strArr); i++ {         fmt.Printf("str[%v]=%v\n", i, strArr[i])     }     fmt.Printf("strArr=%v\n", strArr)

15.将字符串的字母进行大小写的转换：strings.ToLower("Go") // strings.ToUpper("Go")

    str := "goLange Hello"     //str = strings.ToLower(str)     str = strings.ToUpper(str)     fmt.Printf("str=%v\n", str)

    str = strings.TrimSpace("        tn  a long gopher ntrn           ")     fmt.Printf("str=%v\n", str)

    str = strings.Trim("! he!llo!", " !")      fmt.Printf("str=%q\n", str)

18.判断字符串是否以指定的字符串开头：strings.HasPrefix("ftp://192.168.10.1", "ftp")

    b := strings.HasPrefix("ftp://192.168.10.1", "ftp")     fmt.Printf("b=%v\n", b)

19.判断字符串是否以指定的字符串结束：strings.HasSuffix("NLT_abc.jpg", "abc")

    b = strings.HasSuffix("NLT_abcd", "abc")     fmt.Printf("b=%v\n",b)

来源：博客园

作者：顽强的allin

链接：https://www.cnblogs.com/xiangxiaolin/p/11795896.html