mikemccand commented on a change in pull request #1521:
URL: https://github.com/apache/lucene-solr/pull/1521#discussion_r425975833



##########
File path: lucene/core/src/java/org/apache/lucene/util/automaton/RegExp.java
##########
@@ -468,6 +519,37 @@ public RegExp(String s, int syntax_flags) throws 
IllegalArgumentException {
     from = e.from;
     to = e.to;
   }
+  
+  RegExp(Kind kind, RegExp exp1, RegExp exp2, String s, int c, int min, int 
max, int digits, int from, int to){    
+    this.originalString = null;
+    this.kind = kind;
+    this.flags = 0;
+    this.exp1=exp1;

Review comment:
       Can we be consistent about the spaces around `=`?

##########
File path: lucene/core/src/java/org/apache/lucene/util/automaton/RegExp.java
##########
@@ -365,8 +365,43 @@
  */
 public class RegExp {
   
-  enum Kind {
-    REGEXP_UNION, REGEXP_CONCATENATION, REGEXP_INTERSECTION, REGEXP_OPTIONAL, 
REGEXP_REPEAT, REGEXP_REPEAT_MIN, REGEXP_REPEAT_MINMAX, REGEXP_COMPLEMENT, 
REGEXP_CHAR, REGEXP_CHAR_RANGE, REGEXP_ANYCHAR, REGEXP_EMPTY, REGEXP_STRING, 
REGEXP_ANYSTRING, REGEXP_AUTOMATON, REGEXP_INTERVAL,
+  /**
+   * The type of expression represented by a RegExp node.

Review comment:
       Can we add `@lucene.experimental` or `@lucene.internal`?
   
   Ahh, nevermind -- the class level javadocs say so already.

##########
File path: lucene/core/src/java/org/apache/lucene/util/automaton/RegExp.java
##########
@@ -468,6 +519,37 @@ public RegExp(String s, int syntax_flags) throws 
IllegalArgumentException {
     from = e.from;
     to = e.to;
   }
+  
+  RegExp(Kind kind, RegExp exp1, RegExp exp2, String s, int c, int min, int 
max, int digits, int from, int to){    
+    this.originalString = null;
+    this.kind = kind;
+    this.flags = 0;
+    this.exp1=exp1;
+    this.exp2=exp2;
+    this.s = s;
+    this.c = c;
+    this.min =min;

Review comment:
       Hmm also here.  Still looking for the last permutation ...




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