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How to check if a string contains certain characters in Golang?

Checking if a string contains certain characters returns True if the string is composed of only the specified characters and False otherwise.

The Contains function from strings package is used to check the given characters present in the given string or not. If the character is present in the given string, then it will return true, otherwise, return false.

Check characters example with boolean output 
// Golang program to illustrate
// the strings.Contains() Function
package main

import (
	"fmt"
	"strings"
)

func main() {
	fmt.Println(strings.Contains("abcd", "b")) // true
	fmt.Println(strings.Contains("abcd", "cb")) // false
}
Check characters example to print the desired result instead of a boolean output 
package main

import (
	"fmt"
	"strings"
)

func main() {
	input := "p"

	str := "Apple"

	if strings.Contains(str, input) {
		fmt.Println("Yes")
	}
}
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