test if file is valid FASTA using grep (i.e. full file matching single regular expression)

What is a simple way to test if given file is valid FASTA:


>genename1 atgcgtcactgNNNNNactgat


I tried the following, but it would give a match if there's at least 1 valid gene, as opposed to all of them

grep -Pli "(>.+\n[atgcn]\n+)*" valid_example.fasta


Use the -v flag to invert the match. Then check to see if any lines match.

You might want to do like

grep -qv [other options] [pattern] $file || echo $file matches

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