[BioPython] regular expression and filtering dna strings

Hello everybody,
I have the following problem:
A have a series of strings, some of them are DNA strings (so they
contain only ACGT), other not.
How can I filter out not DNA strings?
Maybe this can be properly done quickly with regular expression
in python, without using biopython.
Does anyone know how to do that with regular expression ?
Thank you very much,
Enrico.




                
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