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   expr.1p    ( 1 )

оценивать аргументы как выражение (evaluate arguments as an expression)

Операнды (Operands)

The single expression evaluated by expr shall be formed from the
       operand operands, as described in the EXTENDED DESCRIPTION
       section. The application shall ensure that each of the expression
       operator symbols:


           (  )  |  &  =  >  >=  <  <=  !=  +  -  *  /  %  :


       and the symbols integer and string in the table are provided as
       separate arguments to expr.