CharacterSet
extension CharacterSet- 
                  
                  Defines a character set containing characters other than alphanumerics that are allowed in a username. However, these characters cannot be at the start or end of a username. DeclarationSwift static var usernameSeparators: CharacterSet { get }
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                  DeclarationSwift static var validUsernameChars: CharacterSet { get }
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                  Defines a character set containing characters that might delineate hashtags or usernames within text content. DeclarationSwift static var contentSeparators: CharacterSet { get }
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           CharacterSet Extension Reference
      CharacterSet Extension Reference