Summary of string lookup methods in the Go language

func Contains(s, substr string) bool is a function that looks up whether a character exists in the string and returns true if it does

import (

 "fmt"

 "strings"

)
func main() {

 fmt.Println(strings.Contains("widuu", "wi")) //true

 fmt.Println(strings.Contains("wi", "widuu")) //false

}

func ContainsAny(s, chars string) bool this is the query string contains more than one character

import (

 "fmt"

 "strings"

)
func main() {

 fmt.Println(strings.ContainsAny("widuu", "w&d")) //true

}

3.func ContainsRune(s string, r rune) bool, which of course is whether the rune type is included in the string, where rune is utf8.RUneCountString can fully represent all Unicode characters

import (

 "fmt"

 "strings"

)
func main() {

 fmt.Println(strings.ContainsRune("widuu", rune('w'))) //true

 fmt.Println(strings.ContainsRune("widuu", 20))        //fasle

}

func Count(s, sep string) int is the output of how many matched characters in a string

import (

 "fmt"

 "strings"

)
func main() {

 fmt.Println(strings.Count("widuu", "uu")) //1

 fmt.Println(strings.Count("widuu", "u"))  //2

}

func Index(s, sep string) int is a function that looks up a string and returns the current location, all of which is of type string, and then int's location

import (

 "fmt"

 "strings"

)
func main() {

 fmt.Println(strings.Index("widuu", "i")) //1

 fmt.Println(strings.Index("widuu", "u")) //3

}

func IndexAny(s, chars string) int this function is a lookup of the first occurrence of the string, and returns -1 if it does not exist

import (

 "fmt"

 "strings"

)
func main() {

 fmt.Println(strings.IndexAny("widuu", "u")) //3

}

7.func IndexByte(s string, c byte) int, this function function is still looking for the location of the first thick line, only this time C is of type byte, the return location is found, but -1 cannot be found

import (

 "fmt"

 "strings"

)
func main() {

 fmt.Println(strings.IndexByte("hello xiaowei", 'x')) //6

}

8.func IndexRune(s string, r rune) int, again find the location, only this time it is of type rune

import (

 "fmt"

 "strings"

)
func main() {

 fmt.Println(strings.IndexRune("widuu", rune('w'))) //0

}

func IndexFunc(s string, f func(rune) bool) int

import (

 "fmt"

 "strings"

)
func main() {

 fmt.Println(strings.IndexFunc("nihaoma", split)) //3

}
func split(r rune) bool {

 if r == 'a' {

  return true

 }

 return false

}

10.func LastIndex(s, sep string) int (s, sep string) int (func, sep string

import (

 "fmt"

 "strings"

)
func main() {

 fmt.Println(strings.LastIndex("widuu", "u")) // 4

}

11.func LastIndexAny(s, chars string) int this is the opposite of indexAny and is the last one to look for

import (

 "fmt"

 "strings"

)
func main() {

 fmt.Println(strings.ContainsAny("widuu", "w&d")) //true

}

0