diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AspNetCoreServerCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AspNetCoreServerCodegen.java
index fe873112901..cd9466e208b 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AspNetCoreServerCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AspNetCoreServerCodegen.java
@@ -251,4 +251,9 @@ public class AspNetCoreServerCodegen extends AbstractCSharpCodegen {
         // To avoid unexpected behaviors when options are passed programmatically such as { "useCollection": "" }
         return super.processCompiler(compiler).emptyStringIsFalse(true);
     }
+
+    @Override
+    public String toRegularExpression(String pattern) {
+        return escapeText(pattern);
+    }
 }
diff --git a/samples/server/petstore/aspnetcore/.openapi-generator/VERSION b/samples/server/petstore/aspnetcore/.openapi-generator/VERSION
index 6d94c9c2e12..e24c1f857e0 100644
--- a/samples/server/petstore/aspnetcore/.openapi-generator/VERSION
+++ b/samples/server/petstore/aspnetcore/.openapi-generator/VERSION
@@ -1 +1 @@
-3.3.0-SNAPSHOT
\ No newline at end of file
+3.3.3-SNAPSHOT
\ No newline at end of file