Useful piece of Powershell to search for a file(s) / item(s) in the site recycle bin and then restore it/them.

Change the regular expression after match to change what files to search for.

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$spsite = (Get-SPSite "http://mysite" )
$files = $spsite.RecycleBin | ?{$_.Title -match "myfile\d{2}"}

foreach ($file in $files) {
Write-Host "Found $($file.Title)" $spsite.RecycleBin.Restore($file.ID)
}