newswan

 echo "a123bcd4sd" | grep -Eo "[a-zA-Z]{2,}"
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newswan

Powershell

$sour = "D:\work"
Push-Location -Paht $sour
Get-ChildItem -Filter "*.txt" | ForEach-Object {
	$str = $_.BaseName -replace ".*?([a-zA-Z]{2,}).*",'$1'
	if ( -Not ( Test-Path $str ) ) {
		New-Item -Type Directory -Path $str
	}
	Move-Item -Path $_ -Destination $str
}
Pop-Location 
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