docs: public final void backReferenceExpression() throws RecognitionException {
  		try {
  			// src/main/resources/org/drools/compiler/lang/DRL6Expressions.g:545:5: ( ( DOT DOT DIV )=> ( DOT DOT DIV )+ unaryExpressionNotPlusMinus )
  			// src/main/resources/org/drools/compiler/lang/DRL6Expressions.g:545:8: ( DOT DOT DIV )=> ( DOT DOT DIV )+ unaryExpressionNotPlusMinus
  			{
  			// src/main/resources/org/drools/compiler/lang/DRL6Expressions.g:545:25: ( DOT DOT DIV )+
  			int cnt56=0;
  			loop56:
  			while (true) {
  				int alt56=2;
  				int LA56_0 = input.LA(1);
  				if ( (LA56_0==DOT) ) {
  					alt56=1;
  				}
  
  				switch (alt56) {
  				case 1 :
  					// src/main/resources/org/drools/compiler/lang/DRL6Expressions.g:545:26: DOT DOT DIV
  					{
  					match(input,DOT,FOLLOW_DOT_in_backReferenceExpression2787); if (state.failed) return;
  					match(input,DOT,FOLLOW_DOT_in_backReferenceExpression2789); if (state.failed) return;
  					match(input,DIV,FOLLOW_DIV_in_backReferenceExpression2791); if (state.failed) return;
  					}
  					break;
  
  				default :
  					if ( cnt56 >= 1 ) break loop56;
  					if (state.backtracking>0) {state.failed=true; return;}
  					EarlyExitException eee = new EarlyExitException(56, input);
  					throw eee;
  				}
  				cnt56++;
  			}
  
  			pushFollow(FOLLOW_unaryExpressionNotPlusMinus_in_backReferenceExpression2795);
  			unaryExpressionNotPlusMinus();
  			state._fsp--;
  			if (state.failed) return;
  			}
  
  		}
  
  		catch (RecognitionException re) {
  		    throw re;
  		}
  
  		finally {
  			// do for sure before leaving
  		}
  	}