IndexAny Function in Golang

strings.IndexAny is a built-in function in Golang which is used to get the index of the first instance of any Unicode code point from the input substring. If the substring is found, it returns the position starting from 0; else it returns -1.

Syntax

func IndexAny(s, chars string) int

Where,

• s – The original given string.
• chars – It is the substring that is to be checked in the given string.

Example 1

Take a look at the following example.

package main
import (
   "fmt"
   "strings"
)
func main() {

   // Defining the Variables
   var str string
   var charstring string
   var text int

   // Intializing the Strings
   str = "IndexAny String Function"
   charstring = "Hyderabad"

   // Using the IndexAny Function
   text = strings.IndexAny(str, charstring)
   
   // Display the Strings
   fmt.Println("Given String:", str)
   fmt.Println("Substring:", charstring)

   // Output of IndexAny
   fmt.Println("IndexAny of Substring characters:", text)
}

Output

It will generate the following output −

Given String: IndexAny String Function
Substring: Hyderabad
IndexAny of Substring characters: 2

Observe that the character "d" in the substring appears at the index "2" in the given string. Hence, IndexAny() returns "2".

Example 2

Let us take another example −

package main
import (
   "fmt"
   "strings"
)
func main() {

   // Initializing the Strings
   x := "IndexAny String Function"
   y := "Golang Strings Package"
   
   // Display the Strings
   fmt.Println("First String:", x)
   fmt.Println("Second String:", y)

   // Using the IndexAny Function
   result1 := strings.IndexAny(x, "net")
   result2 := strings.IndexAny(x, "lp")
   result3 := strings.IndexAny(y, "Language")
   result4 := strings.IndexAny(y, "go")

   // Display the IndexAny Output
   fmt.Println("IndexAny of 'net' in the 1st String:", result1)
   fmt.Println("IndexAny of 'lp' in the 1st String:", result2)
   fmt.Println("IndexAny of 'Language' in the 2nd String:", result3)
   fmt.Println("IndexAny of 'go' in the 2nd String:", result4)
}

Output

It will generate the following output −

First String: IndexAny String Function
Second String: Golang Strings Package
IndexAny of 'net' in the 1st String: 1
IndexAny of 'lp' in the 1st String: -1
IndexAny of 'Language' in the 2nd String: 3
IndexAny of 'go' in the 2nd String: 1

Notice that the characters "l" and "p" in the given substring is not present in the 1st string, hence IndexAny() returns "-1".