strings.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".