let pattern = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,6}"
let str = "[email protected]"

let cola = ColaExpression(pattern)
if cola.isMatch(with: str) {
  print("\(str) is a valid email")
  // [email protected] is a valid email
}

if str.isMatch(pattern: pattern) {
  print("\(str) is a valid email")
  // [email protected] is a valid email
}

let pattern = "[a-z]{3}"
let str = "AAAbbbCCCdddEEEfff"

let cola = ColaExpression(pattern)
let matches = cola.matches(of: str)
// ["bbb", "ddd", "fff"]

let matches = str.matches(pattern: pattern)
// ["bbb", "ddd", "fff"]

let pattern = "[a-z]"
let str = "AAAbbbCCCdddEEEfff"
let replacement = "-"

let cola = ColaExpression(pattern)
let replaced = cola.replaceOccurences(in: str, with: replacement)
// AAA---CCC---EEE---

let replaced = str.replaceOccurences(matches: pattern, with: replacement)
// AAA---CCC---EEE---