Introduction to some string operations in go language

Split the string by single/multiple characters

Cut the string according to the specified content

str := "hello world"
res0 :=strings.Split(str,"w")
fmt.Println(res0)	//[hello  orld]

The string str starts with ; Split at the end

str := "hello;world;"
res1 := strings.SplitAfter(str,";")	//[hello; world; ]
fmt.Println(res1)

Judge whether str contains a certain string

Return bool type, if not, it is false

str := "hello world"
fmt.Println(strings.Contains(str, "lo"), strings.Contains(str, "t")) //true false

Judge Whether it starts/ends with a certain string

str := "hello world"
//以某个字符串开始
i := strings.HasPrefix(str, "h")
j := strings.HasPrefix(str, "t")
fmt.Println(i, j) //true false
//以某个字符串结尾
i1 := strings.HasSuffix(str, "h")
j1 := strings.HasSuffix(str, "d") //是不是以d结尾的
fmt.Println(i1, j1)               //false true

Get the first/last occurrence position of the specified content in the string

str := "hello world"
// 获取指定内容在str中首次出现的位置，如果有则返回该元素索引, 如果没有则返回-1
fmt.Println(strings.Index(str, "l"), ",", strings.Index(str, "t")) //2 , -1
 
// 获取指定内容在str中最后一次出现的位置, 如果有则返回该元素索引, 如果没有则返回-1
fmt.Println(strings.LastIndex(str, "l"), ",", strings.LastIndex(str, "t")) //9 , -1

Replace The specified content in the string

//将str中的 hello 替换为 你好
str := "hello world"
fmt.Println(strings.Replace(str, "hello", "你好", 1)) //你好 world  
//最后一个参数表示如果str中有多个hello的话，只替换前n个

The number of occurrences of the specified content in the string

str := "hello world"
//字符串中包含某字符串的次数, 没有时返回0
fmt.Println(strings.Count(str, "l"), strings.Count(str, "t")) //3 0

The entire string is repeated n times

str := "hello world"
//	将字符串str整体重复n次
fmt.Println(strings.Repeat(str, 2))	// hello worldhello world

Convert to uppercase and lowercase

//转大写&小写
str1 := "HELLO world"
fmt.Println(strings.ToLower(str1))	//全体转小写 hello world
fmt.Println(strings.ToUpper(str1))	//全体转大写 HELLO WORLD

Use specified characters to link all elements in the slice into a string

//用指定字符将 string 类型的 slice 中所有元素链接成一个字符串
str4 := []string{"a","b","c","d"}
fmt.Println(strings.Join(str4,"-"))	//用-连接str4中的所有元素a-b-c-d

Remove the specified content in the string (including spaces)

str2 := "  hello world tt"
 
//去掉字符串尾指定的字符
fmt.Println(strings.TrimRight(str2,"t"))	//  hello world 字符串首时为TrimLeft()
 
//去掉字符串首尾的空格
fmt.Println(strings.TrimSpace(str2))	//hello world
 
//去掉字符串首尾指定的字符
fmt.Println(strings.Trim(str2,"t"))		//  hello world
fmt.Println(strings.Trim(str2,"ttt"))	//注意相同的字母即时数量比str的多也能去掉  hello world
fmt.Println(strings.Trim(str2,"  "))	//去除首尾空格hello world tt
fmt.Println(strings.Trim(str2,"b"))		//没有b时不报错返回原字符串  hello world tt

For more related knowledge, please pay attention to the go language tutorial column

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