locale(3)

NAME
     locale - Perl pragma to use and avoid POSIX locales for built-in
     operations

SYNOPSIS
         @x = sort @y;       # ASCII sorting order
         {
             use locale;
             @x = sort @y;   # Locale-defined sorting order
         }
         @x = sort @y;       # ASCII sorting order again


DESCRIPTION
     This pragma tells the compiler to enable (or disable) the use of POSIX
     locales for built-in operations (LC_CTYPE for regular expressions, and
     LC_COLLATE for string comparison).  Each "use locale" or "no locale"
     affects statements to the end of the enclosing BLOCK.