let encodedString = targetString.stringByAddingPercentEncodingWithAllowedCharacters(NSCharacterSet.URLQueryAllowedCharacterSet()) let decodedString = encodedString.stringByRemovingPercentEncoding; extension String { func escapeStr() -> String { var raw: NSString = self var str = CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,raw,"[].",":/?&=;+!@#$()',*",CFStringConvertNSStringEncoding
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