Scalar Variables and Operators

Double Quoted String Literals

• Valid Perl strings are sequences of zero or more characters.
• Double quoted string literals consist of every character between the starting and ending quote, but with interpretation of internal characters. This interpretation is very similar to how C interprets strings.
• Example double quoted strings (shown as string literals):

   
  "hello world\n"     # hello, a space, and world, then a newline
  # The word Ding, an exclamation point,
  # and the ASCII character with octal value 007
  "Ding! \007"
  "one\ttwo\tthree"   # One, a tab, two, a tab, and three
  

• Escape sequences and their Actions:
  

  Table of escape sequences and their actions

  Escape Sequence	Effect
  \n	Newline (correct for your system)
  \r	Carriage return
  \t	Horizontal tab
  \f	Form feed
  \b	Backspace
  \a	Bell
  \e	Escape
  \007	Character corresponding to any octal value (octal 7 = bell)
  \x4a	Character corresponding to any hexadecimal value (hex 4a = "J")
  \cN	Any control character (here ctrl-N)
  \\	Backslash ("\")
  \"	Double Quote (""")
  \l	Lowercase next letter
  \L	Lowercase all following characters until \E
  \u	Uppercase next letter
  \U	Uppercase all following characters until \E
  \Q	Backslash-quote all non-alphanumerics characters until \E
  \E	Stop \L, \U, \Q

• Double quoted strings are also variable interpolated.
  That is, any variables in the string are automatically expanded out to their value.