Except for the comma operator and conditional expression, you can also use
these operators with the assignment operator, similar to the way addition (+)
can be combined with assignment (=), giving +=.
Special String Constants
Perl supports string constants that have special meaning or cannot be entered
from the keyboard.
Table 46.6 shows most of the constants supported by Perl.
Table 46.6 Perl Special String Constants
ExpressionMeaning\ The means of including a backslash\a The alert or bell character\b Backspace\cC Control character (like holding the Ctrl key down and pressing
the C character)\e Escape\f Formfeed\n Newline\r Carriage return\t Tab\xNN Indicates that NN is a hexadecimal number\0NNN Indicates that NNN is an octal (base 8) number