compound pattern { action }

    Compound  Pattern.    The  pattern  combines  regular  expressions with
    logical NOT, '!',  logical AND, '&&',  logical OR, '||',  bit-wise AND,
    '&', bit-wise  OR, '|',  bit-wise XOR,  '@', the  relational operators,
    '<=', '<', '>',  '>=', the equality  operators, '==' and  '!=', and the
    matching operators,  '~~' and  '!~'.   The action  is executed for each
    record for which the compound pattern is nonzero.