How to recover data from an erased external hard drive on Mac OS?

How to recover data from an erased external hard drive on Mac OS? Hi, I have an external USB hard drive that was initially formatted as Mac OS Extended (Journaled). It was accidentally erased (using Disk utility) and then again re-formatted to HFS. The hard drive has not been used since (other than to try and recover the data using various tools), so no new data was been written to it.
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bert [Entry]

"This is what I use: ProSoft - Data Rescue you'll want at least the 16 GB version so you don't need to create your own recovery drive. If you have a big drive you'll want the larger recovery drive as the files are copied to the rescue drive.

I'm not sure if any recovery tools can recover your data. Its possible the way you reformat the drive might have scrubbed the drive to a point you can't recover your files. I wish you luck!"