fix negated implicit @rx operator

When an operator starts with '!' and no explicit operator
is specified, a negated @rx operator should be created.
Due to a bug, a regular @rx operator with regex starting
with '!' was created. This commit fixes it

Author: asterite3

src/parser/seclang-parser.cc

@@ -1459,7 +1459,7 @@ namespace yy {
   case 33:
 #line 855 "seclang-parser.yy" // lalr1.cc:859
     {
-        OPERATOR_CONTAINER(yylhs.value.as< std::unique_ptr<Operator> > (), new operators::Rx("!" + utils::string::removeBracketsIfNeeded(yystack_[0].value.as< std::string > ())));
+        OPERATOR_CONTAINER(yylhs.value.as< std::unique_ptr<Operator> > (), new operators::Rx("Rx", utils::string::removeBracketsIfNeeded(yystack_[0].value.as< std::string > ()), true));
         std::string error;
         if (yylhs.value.as< std::unique_ptr<Operator> > ()->init(driver.ref.back(), &error) == false) {
             driver.error(yystack_[2].location, error);

src/parser/seclang-parser.yy

@@ -853,7 +853,7 @@ op:
       }
     | NOT OPERATOR_RX_CONTENT_ONLY
       {
-        OPERATOR_CONTAINER($$, new operators::Rx("!" + utils::string::removeBracketsIfNeeded($2)));
+        OPERATOR_CONTAINER($$, new operators::Rx("Rx", utils::string::removeBracketsIfNeeded($2), true));
         std::string error;
         if ($$->init(driver.ref.back(), &error) == false) {
             driver.error(@0, error);