1181-Minor update to regex

docs/classDiagram.md

@@ -588,7 +588,7 @@ classDiagram
     }
 ```
 
-?> cssClasses cannot be applied at the same time as a relation statement.
+?> cssClasses cannot be added using this shorthand method at the same time as a relation statement.
 
 ?> Due to limitations with existing markup for class diagrams, it is not currently possible to define css classes within the diagram itself.  ***Coming soon!***
 

src/diagrams/class/parser/classDiagram.jison

@@ -50,7 +50,7 @@
 \-\-                  return 'LINE';
 \.\.                  return 'DOTTED_LINE';
 ":"{1}[^:\n;]+        return 'LABEL';
-":::"                 return 'STYLE_SEPARATOR';
+":"{3}                return 'STYLE_SEPARATOR';
 \-                    return 'MINUS';
 "."                   return 'DOT';
 \+                    return 'PLUS';