The best way to know the invalid characters is by understanding the invalid characters in SharePoint
(There can be some different rules for the different SharePoint versions)

Invalid characters – are related to SharePoint

The article (link) below lists the invalid characters in the different situations:

  • In Site names
  • In Folder names
  • In Server names
  • In File names
  • SharePoint invalid Characters
  • Dash (-) in the file names

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