anchor.diff:  
   [discrete]
   [[eql-syntax-comparison-operators]]
  -==== Comparison operators
  +=== Comparison operators
   
   [source,eql]
   ----
  
positive.code: 
  [discrete]
  [[eql-syntax-escape-characters]]
  ==== Escape characters in a string
  
  When used within a string, special characters, such as a carriage return or
  double quote (`"`), must be escaped with a preceding backslash (`\`).
  
negative.code: 
  [discrete]
  [[eql-syntax-match-any-event-category]]
  === Match any event category
  
  To match events of any category, use the `any` keyword. You can also use the
  `any` keyword to search for documents without a event category field.
  