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首先引入這個小文件：

Paste_Image.png

將字符串用MD5加密

extension String {
  var MD5: String! {
  let str = self.cStringUsingEncoding(NSUTF8StringEncoding)
  let strLen = CC_LONG(self.lengthOfBytesUsingEncoding(NSUTF8StringEncoding))
  let digestLen = Int(CC_MD5_DIGEST_LENGTH)
  let result = UnsafeMutablePointer<CUnsignedChar>.alloc(digestLen)
  
  CC_MD5(str!, strLen, result)
  
  let hash = NSMutableString()
  for i in 0..<digestLen {
   hash.appendFormat("%02x", result[i])
  }
  
  result.dealloc(digestLen)
  
  return hash as String
 }
}

把Data用MD5加密

/// NSData
extension NSData {
 var dataToMD5String: String! {
  let digestLength = Int(CC_MD5_DIGEST_LENGTH)
  let md5Buffer = UnsafeMutablePointer<CUnsignedChar>.alloc(digestLength)
  CC_MD5(self.bytes, CC_LONG(self.length), md5Buffer)
  let output = NSMutableString(capacity: Int(CC_MD5_DIGEST_LENGTH * 2))
  for i in 0..<digestLength {
   output.appendFormat("%02x", md5Buffer[i])
  }
  return String(format: output as String)
 }
}

正則匹配

/// 正則匹配
enum RegexType: String {
 case Mail
 case URL
 case Image
 
 var regexText: String {
  switch self {
  case .Mail:
   return "[\\w!#$%&'*+/=?^_`{|}~-]+(?:\\.[\\w!#$%&'*+/=?^_`{|}~-]+)*@(?:[\\w](?:[\\w-]*[\\w])?\\.)+[\\w](?:[\\w-]*[\\w])?"
  case .URL:
   return "(([a-zA-Z0-9\\._-]+\\.[a-zA-Z]{2,6})|([0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}))(:[0-9]{1,4})*(/[a-zA-Z0-9\\&%_\\./-~-]*)?"
  case .Image:
   return "([a-zA-z]+://[^\\s]*)+.(?:jpg|png|gif|jpe?g)"
  }
 }
}

// 方法返回bool類型，判斷是否符合匹配
func regexMatch(input: String, type: RegexType) -> Bool {
 
 let nsText = input as NSString
 
 let regex = try! NSRegularExpression(pattern: type.regexText, options: [.CaseInsensitive, .DotMatchesLineSeparators])
 
 let matches = regex.matchesInString(input, options: NSMatchingOptions.ReportProgress, range: NSMakeRange(0, nsText.length))
 
 if matches.count > 0 {
  return true
 } else {
  return false
 }
}