Do we have list of unsupported characters for azure blob file names?

Question

I'm uploading some files with some different special characters to the blob. It is not getting uploaded. I found that there is some restriction on naming the files of the azure. So I need the list of unsupported unicode characters for blob file names or way to find whether a character is supported in azure blob file name or not.

I had referred below doc on this. They didnt provide any particular list or way to find it. https://learn.microsoft.com/en-us/rest/api/storageservices/naming-and-referencing-shares--directories--files--and-metadata

I need the exact validation of file name validation happening on upload file blade on azure blob

Answer 1

I don't think the Microsoft Docs are very precisely specified.

A blob name must conforming to the following naming rules:

• A blob name can contain any combination of characters.
• A blob name must be at least one character long and cannot be more than 1,024 characters long, for blobs in Azure Storage.
• Blob names are case-sensitive.
• Reserved URL characters must be properly escaped.
• The number of path segments comprising the blob name cannot exceed 254. A path segment is the string between consecutive delimiter characters (e.g., the forward slash '/') that corresponds to the name of a virtual directory.

In my tests I found you cannot have these characters in an Azure Blob name

• Control characters 0x00-0x1F
• Delete 0x7F
• Backslash '\' - Azure converts this to forward slash '/'
• Names ending in full stop '.'

I used the Azure Blob go SDK for doing these tests, so it is possible some of these limitations are due to that.