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I am trying to get a blob from azure:

$name = "myfolder/20180223_064819[1].jpg"
$blob = Get-AzureStorageBlob -Container $container.Name -Context $context -Blob $name -ErrorAction Stop 
$blob -eq $null # is True

and the file is present in storage, in the location specified above, I can see it using the azure storage explorer. However $blob is $null rather than throwing an error which is what usually happens when no file is found. I have been accessing other files fine.

If I create another file myfile/201802230648191.jpg. In this code $blob2 returns an object (which is what you'd expect)

$name = "myfolder/201802230648191.jpg"
$blob2 = Get-AzureStorageBlob -Container $container.Name -Context $context -Blob $name -ErrorAction Stop 
$blob2 -eq $null # is False

I have tried url escaping the name but then it throws a not found exception. I have looked at the naming rules here: https://docs.microsoft.com/en-us/rest/api/storageservices/Naming-and-Referencing-Containers--Blobs--and-Metadata but don't appear to be violating any.

So, my question is, why does $blob return null instead of the object?

And also, How can I get blobs with a name containing [ or ] ?

I test your code and got the same result as you. Then I checked the Get-AzureStorageBlob doc and I found it supports wildcard search even the support for Accept wildcard characters is false.

Then I further tested the code. I changed the picture name to Snipaste_2018-11-02_13-56-321.png without and still use the code, It worked. Here is the result. So the problem is because the in the $name was recognized as wildcard characters.

So if you still insist your name, you could use -Prefix instead of -Blob. Here is my result.

If you still have questions, please let me know.

I have answer this question in: https://github.com/Azure/azure-powershell/issues/7848#issuecomment-439307333

Generally agree with George, use -prefix should be work since -prefix not support wildcard search. Anyway, this will also get other blob start with the blob name, like test/new11_22[1].jpgab, to only get the matched blob, you can filter the blobs with a pipeline like:

PS C:WINDOWSsystem32>> Get-AzureStorageBlob -Container $containerName -Context $ctx -prefix test/new11_22[1].jpg | ? $_.Name -eq "test/new11_22[1].jpg"


 Container Uri: https://***.blob.core.windows.net/***

Name BlobType Length ContentType LastModified AccessTier SnapshotTime IsDeleted 
---- -------- ------ ----------- ------------ ---------- ------------ --------- 
test/new11_22[1].jpg BlockBlob 2097152 application/octet-stream 2018-11-16 07:29:19Z False 

Actually the benavior of Get-AzureStorageBlob is aligned with other Powershell cmdlets like Get-Item:
like for file c:tempnew11_22[1].jpg, following is the result.

PS C:WINDOWSsystem32> get-item c:tempnew11_22[1].jpg

PS C:WINDOWSsystem32> get-item c:tempnew11_22?1?.jpg


 Directory: C:temp


Mode LastWriteTime Length Name 
---- ------------- ------ ---- 
-a---- 10/19/2018 7:27 PM 2097152 new11_22[1].jpg