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How to find the Index of a string in Golang?
Strings.Index is a built-in function in Golang that returns the index of the first instance of a substring in a given string. If the substring is not available in the given string, then it returns -1.
Syntax
The syntax of Index() is as follows −
func Index(s, substring string) int
Where,
- s – Original given string
- substring – It is the string whose Index value we need to find
Example 1
Let us consider the following example −
package main
import (
"fmt"
"strings"
)
// Main function
func main() {
// Initializing the Strings
x := "Learn Golang on Tutorialspoint"
// Display the Strings
fmt.Println("Given String:", x)
// Using the Index Function
result1 := strings.Index(x, "Golang")
result2 := strings.Index(x, "TUTORIALSPOINT")
// Display the Index Output
fmt.Println("Index of 'Golang' in the Given String:", result1)
fmt.Println("Index 'TUTORIALSPOINT' in the Given String:", result2)
}Output
It will produce the following output −
Given String: Learn Golang on Tutorialspoint Index of 'Golang' in the Given String: 6 Index 'TUTORIALSPOINT' in the Given String: -1
Notice that the Index() function is case-sensitive. That is why, it returns the index of TUTORIALSPOINT as -1.
Example 2
Let us take another example.
package main
import (
"fmt"
"strings"
)
func main() {
// Initializing the Strings
p := "Index String Function"
q := "String Package"
// Display the Strings
fmt.Println("First String:", p)
fmt.Println("Second String:", q)
// Using the Index Function
output1 := strings.Index(p, "Function")
output2 := strings.Index(q, "Package")
// Display the Index Output
fmt.Println("Index of 'Function' in the 1st String:", output1)
fmt.Println("Index of 'Package' in the 2nd String:", output2)
}Output
It will generate the following output −
First String: Index String Function Second String: String Package Index of 'Function' in the 1st String: 13 Index of 'Package' in the 2nd String: 7
Updated on: 10-Mar-2022
10K+ Views
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