From the perlop manual page: 
           left        terms and list operators (leftward)
           left        ->
           nonassoc    ++ --
           right       **
           right       ! ~ \ and unary + and -
           left        =~ !~
           left        * / % x
           left        + - .
           left        << >>
           nonassoc    named unary operators
           nonassoc    < > <= >= lt gt le ge
           nonassoc    == != <=> eq ne cmp
           left        &
           left        | ^
           left        &&
           left        ||
           nonassoc    ..  ...
           right       ?:
           right       = += -= *= etc.
           left        , =>
           nonassoc    list operators (rightward)
           right       not
           left        and
           left        or xor
(Eigth line, marked in red). And further down: 
       Additive Operators

       Binary "+" returns the sum of two numbers.

       Binary "-" returns the difference of two numbers.

       Binary "." concatenates two strings.

In reply to Re^2: Solicitation For Ideas: Tutorial On Precedence by Anonymous Monk
in thread Solicitation For Ideas: Tutorial On Precedence by Limbic~Region

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