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(?=(?:.*[A-Za-z].*){1}) # at least one of A-Za-z
(?=(?:.*[0-9].*){1})    # at least one of 0-9
(?=(?:^.{8}$)           # match exactly 8 charactters

qr/^
(?=(?:.*[A-Za-z].*){1}) # at least one of A-Za-z
...
(?=(?:^.{8}$)           # match exactly 8 charactters
$
/x;