Hello @anto thomas and welcome to Microsoft Q&A.
I tried with a binary blob dataset, placing * for the filename. Unfortunately this did not work, it looked for a file named *
rather than treating as a wildcard. In addition, in the blob dataset documentation, next to filename it says:
The file name under the given container and folder path. If you want to use wildcard to filter files, skip this setting and specify that in activity source settings.
Unfortunately validation activity has no relevant source setting. So, it looks like the answer is no.
However, have you considered using an event trigger? An event trigger accepts wildcards, and will start the pipeline when the file is created. This way, you will not need to check for the existence of the file, the file will start the pipeline!