anchor.diff:  [[regexp_syntax]]
   ==== Syntax
   ```
  -match-value [NOT] REGEXP pattern
  +match-value [NOT] REGEXP regular-expression
   ```
   
   * `_match-value_`
  
positive.code: | <<in_predicate,IN Predicate>> | Determines if a sequence of values is equal to any of the sequences of
  values in a list of sequences.
  | <<like_predicate,LIKE Predicate>> | Searches for character strings that match a pattern.
  | <<regexp_predicate,REGEXP Predicate>> | Searches for character strings that match a pattern, The pattern 
  can be an extended regular expression.
  | <<null_predicate,NULL Predicate>> | Determines whether all the values in a sequence of values are null.
  | <<quantified_comparison_predicates,Quantified Comparison Predicates>> +  
  (ALL, ANY, SOME ) | Compares the values of sequences of expressions to the values in each
  
negative.code: 
  * `_pattern_`
  +
  is a character value expression that specifies a regular expression. 
  Trafodion regular expressions follow POSIX regular expression rules.
  
  
  [[using_not]]
  