added some comments

Author: lmasroca

core/src/main/antlr4/org/evomaster/core/parser/RegexJava.g4

@@ -131,11 +131,18 @@ CharacterEscape
  //| IdentityEscape
  ;
 
+// TODO missing \p escapes
 fragment PCharacterClassEscapeLabel
  : PosixCharacterClassLabel
  | UnicodeCategoriesLabel
+// | UnicodeScriptsLabel // https://docs.oracle.com/javase/8/docs/api/java/util/regex/Pattern.html#usc
+// | UnicodeBlocksLabel // https://docs.oracle.com/javase/8/docs/api/java/util/regex/Pattern.html#ubc
+// | UnicodeBinaryProperiesLabel // https://docs.oracle.com/javase/8/docs/api/java/util/regex/Pattern.html#ubpc
+// | javalangCharacterClassesLabel // https://docs.oracle.com/javase/8/docs/api/java/util/regex/Pattern.html#jcc
  ;
 
+// TODO missing Unicode categories labels and implementations
+// https://docs.oracle.com/javase/8/docs/api/java/util/regex/Pattern.html#ucc
 fragment UnicodeCategoriesLabel
  : 'Pe'
  ;

core/src/main/kotlin/org/evomaster/core/search/gene/regex/CharacterClassEscapeRxGene.kt

@@ -82,7 +82,7 @@ class CharacterClassEscapeRxGene(
             // Unicode category character classes (\p{X})
             val unicodeCategorySets = mapOf(
                 "Pe" to stringToListOfCharacterRanges(")]}")
-                // more Unicode categories will be added here
+                // more Unicode categories will be added here in the future
             )
 
             // create both normal and negated version for all