import Foundation
func containsIgnoreCase(_ str: String, _ toFind: String) -> Bool {
return str.range(of: toFind, options: .caseInsensitive) != nil
}
let str = "The FOX Profession is Swift Programmer"
let toFind = "fox"
let contains = containsIgnoreCase(str, toFind)
print(contains)
/*
run:
true
*/