allow leading underscore in query param regex since it was allowed earlier

Author: nicky1038

src/schema-routes/schema-routes.ts

@@ -96,7 +96,7 @@ export class SchemaRoutes {
       originalRouteName;
 
     const pathParamMatches = (routeName || "").match(
-      /({[a-zA-Z]([-_.]*[a-zA-Z0-9])*})|(:[a-zA-Z]([-_.]*[a-zA-Z0-9])*:?)/g,
+      /({[a-zA-Z_]([-_.]*[a-zA-Z0-9])*})|(:[a-zA-Z_]([-_.]*[a-zA-Z0-9])*:?)/g,
     );
 
     // used in case when path parameters is not declared in requestInfo.parameters ("in": "path")