Scalar Variables and Operators

Scalar Operators for Strings

• Valid Operators for Scalar Strings: Return the modified string.

  Table of Operators for Scalar Strings

  Operator Symbol	Operation
  .	Concatenation (append)
  x n	Repeat string n times

• Examples:

  "Hello" . " World" # Returns string "Hello World"
  "Z" . ( "o" x 8 ) . "m" # Returns "Zoooooooom"
  

• Note that full regular expression support is also built in to Perl, and it provides one of the richest set of string operators known to man. We will learn about them later.
• Valid Logical Operators for Scalar Strings: Return true or false.

  Table of Logical Operators for Scalar Strings

  Operator Symbol	Operation
  eq	Alphabetic Equal To
  lt	Alphabetic Less Than
  gt	Alphabetic Greater Than
  le	Alphabetic Less Than or Equal
  ge	Alphabetic Greater Than or Equal
  ne	Alphabetic Not Equal

• Examples:
  "Alpha" lt "Beta" # The word Alpha comes before the word Beta in alpha sort (will be true)
  "Eight" ge "Seven" # The word Eight comes after the word Seven in alpha sort (will be false)
  "Hello" eq "Hello" # Check if strings are equal (will be true)
  
• There are different operators for scalar strings and scalar numbers because Perl as a general rule does not know (or care) if a scalar is a string or an integer. This means that 2 < 10 is true, but "2" lt "10" is false.