anchor.diff:  
   *Return Type*: [.returnType]#Number#
   
  -*Examples*: ${random():mod(10):plus(1)} returns random number between 1 and 10 inclusive.
  +*Examples*: `${random():mod(10):plus(1)}` returns random number between 1 and 10 inclusive.
   
   [.function]
   === math
  
positive.code: - \r (carriage return)
  - \n (new-line)
  
  Additionally, a number is considered a ``special character'' if it is the first character of the attribute name.
  If any of these special characters is present in an attribute is quoted by using either single or double quotes.
  The Expression Language allows single quotes and double quotes to be used interchangeably. For example, the following
  can be used to escape an attribute named ``my attribute'': `${"my attribute"}` or `${'my attribute'}`.
  
  In this example, the value to be returned is the value of the "my attribute" value, if it exists. If that attribute
  does not exist, the Expression Language will then look for a System Environment Variable named "my attribute." If
  
negative.code: functions that can be chained together.
  
  Any FlowFile attribute can be referenced using the Expression Language. However, if the attribute
  name contains a "special character", the attribute name must be escaped by quoting it. The following
  characters are each considered "special characters":
  
  - $ (dollar sign)
  - | (pipe)
  