As the title, I have a [fasta] file that obtained from a [gtf] file,

>cuff102.1

atcgtaaagggcgat

>cuff103.1

gtcgttgactNNNNNNNNgtc

and I want to get the output like this to filter the sequences that contain any not[ATCG] character?

I have a large of sequences to filter. I thought a way that firstly convert the file to [interval] file, and secondly SELECT the line not matching the patten /\t[ATCGatcg]*[^ATCGatcg]/.