[Perl]字串運算子

String Operator	Purpose
x	Returns a string consisting of the string on the left of the operand, repeated the number of times of the right operand.
．	Concatenates the two strings on both sides of the operator.
eq	Returns True if the two operands are equivalent, False otherwise.
ne	Returns True if the two operands are not equal, False otherwise.
le	Returns True if the operand on the left is stringwise less than the operand on the right of the operator. Returns False otherwise.
lt	Returns True if the operand on the left is stringwise less than or equal to the operand on the right of the operator. Returns False otherwise.
ge	Returns True if the operand on the left is stringwise greater than or equal to the operand on the right of the operator. Returns False otherwise.
gt	Returns True if the operand on the left is stringwise greater than the operand on the right of the operator. Returns False otherwise.
cmp	Returns -1, 0, or 1 if the left operand is stringwise less than, equal to, or greater than the right operand.
,	Evaluates the left operand, the evaluates the right operand. It returns the result of the right operand.
++	Increments the string by one alphabetic value.