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strings.Index() Function in Golang With Examples
  • Last Updated : 19 Apr, 2020

strings.Index() Function in Golang is used to get the first instance of a specified substring. If the substring is not found, then this method will return -1.

Syntax:

func Index(str, sbstr string) int

Here, str is the original string and sbstr is a string whose we want to find index value.

Example 1:




// Go program to illustrate the 
// String Index() Function
  
package main 
     
import ( 
    "fmt"
    "strings"
     
// Main function 
func main() { 
     
    // Creating and initializing the strings 
    str1 := "Welcome to GeeksforGeeks"
    str2 := "My name is XYZ"
     
    // Displaying strings 
    fmt.Println("String 1: ", str1) 
    fmt.Println("String 2: ", str2) 
     
    // Using Index() function 
    res1 := strings.Index(str1, "Geeks"
    res2 := strings.Index(str2, "is"
   
    // Displaying the result 
    fmt.Println("\nIndex values:"
    fmt.Println("Result 1: ", res1) 
    fmt.Println("Result 2: ", res2) 
     

Output:

String 1:  Welcome to GeeksforGeeks
String 2:  My name is XYZ

Index values:
Result 1:  11
Result 2:  8

Example 2:




// Go program to illustrate the
// String Index() Function
  
package main
  
import (
    "fmt"
    "strings"
)
  
// Main function
func main() {
  
    // Using Index() function
    res1 := strings.Index("GFG", "H")
    res2 := strings.Index("GeeksforGeeks", "for")
  
    // Displaying the result
    fmt.Println("Result 1: ", res1)
    fmt.Println("Result 2: ", res2)
  
}

Output:

Result 1:  -1
Result 2:  5



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