Here is a powershell script to search azure’s blob storage by file extension:

## Install Azure powershell, instructions @ https://docs.microsoft.com/en-us/powershell/azure/install-azurerm-ps
## GDURGHA - 2017-09-20
$StorageAcctName = 'STORAGE ACCT NAME'
$StorageAcctKey = 'SECURE KEY HERE'
$ContainerName = 'myfiles'

$StorageContext = New-AzureStorageContext -StorageAccountName $StorageAcctName -StorageAccountKey $StorageAcctKey
$blobs = Get-AzureStorageBlob -Container $ContainerName -Context $StorageContext -MaxCount 10

# Search by Suffix using powershell
Write-Output $blobs | Where-Object {$_.Name -like "*.jpg"} | Select-Object {$_.Name}


Write-Output "-- Search finished --"