stringByReplacingOccurrencesOfString - Replace characters within a string by other characters

Type these codes in the playground:

import UIKit

let str = "Hello##World##123##!!"

var strTemp : String!

strTemp = str.stringByReplacingOccurrencesOfString("##", withString: "\n", options: NSStringCompareOptions.RegularExpressionSearch, range: nil)

println(strTemp)

The result:

Hello

World

123

!!

Related string function:

componentsSeparatedByCharactersInSet and join - Remove specific characters in a string