"Awesome".contains("me") == true
"Awesome".contains("Aw") == true
"Awesome".contains("so") == true
"Awesome".contains("Dude") == false

"ReplaceMe".replace("Me", withString: "You") == "ReplaceYou"
"MeReplace".replace("Me", withString: "You") == "YouReplace"
"ReplaceMeNow".replace("Me", withString: "You") == "ReplaceYouNow"

"0123456789"[0] == "0"
"0123456789"[5] == "5"
"0123456789"[9] == "9"

"0123456789"[5...6] == "5"
"0123456789"[0...1] == "0"
"0123456789"[8...9] == "8"
"0123456789"[1...5] == "1234"
"Reply"[0...4] == "Repl"
"Hello, playground"[0...5] == "Hello"
"Coolness"[4...7] == "nes"

"Awesome".indexOf("nothin") == -1
"Awesome".indexOf("Awe") == 0
"Awesome".indexOf("some") == 3
"Awesome".indexOf("e", startIndex: 3) == 6
"Awesome".lastIndexOf("e") == 6
"Cool".lastIndexOf("o") == 2

var emailRegex = "[a-z_\\-\\.]+@[a-z_\\-\\.]{3,}"
"email@test.com".isMatch(emailRegex, options: NSRegularExpressionOptions.CaseInsensitive) == true
"email-test.com".isMatch(emailRegex, options: NSRegularExpressionOptions.CaseInsensitive) == false

var testText = "email@test.com, other@test.com, yet-another@test.com"
var matches = testText.getMatches(emailRegex, options: NSRegularExpressionOptions.CaseInsensitive)
matches.count == 3
testText.subString(matches[0].range.location, length: matches[0].range.length) == "email@test.com"
testText.subString(matches[1].range.location, length: matches[1].range.length) == "other@test.com"
testText.subString(matches[2].range.location, length: matches[2].range.length) == "yet-another@test.com"

"Reply".pluralize(0) == "Replies"
"Reply".pluralize(1) == "Reply"
"Reply".pluralize(2) == "Replies"
"REPLY".pluralize(3) == "REPLIES"
"Horse".pluralize(2) == "Horses"
"Boy".pluralize(2) == "Boys"
"Cut".pluralize(2) == "Cuts"
"Boss".pluralize(2) == "Bosses"
"Domino".pluralize(2) == "Dominoes"