Simple Regular Expression Search Function

SimpleRegExSearch.swift

func search(pattern: String, input text: String) -> [NSTextCheckingResult] {
  
  guard let regex = try? NSRegularExpression.init(pattern: pattern, options: .caseInsensitive) else {
    return []
  }
  
  return regex.matches(in: text, options: [], range: NSRange.init(location: 0, length: text.count))
}

func searchStrings(pattern: String, input text: String) -> [String] {
    return search(pattern: pattern, input: text).map { (text as NSString).substring(with:$0.range) }
}