public void visit(LORegexp binOp) throws VisitorException {
ExpressionOperator left = binOp.getLhsOperand();
ExpressionOperator right = binOp.getRhsOperand();
RegexExpression ae = new RegexExpression(exprPlan, binOp.getType()
, exprOpsMap.get(left), exprOpsMap.get(right));
exprOpsMap.put(binOp, ae);
}