Hi Jen,As the title, I have a [fasta] file that obtained from a [gtf] file,
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]/.Am I right? Or there is a one-step way ?

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