diff --git a/nmpolicy/internal/expander/state_expander.go b/nmpolicy/internal/expander/state_expander.go
index 66eca170..3cfd287c 100644
--- a/nmpolicy/internal/expander/state_expander.go
+++ b/nmpolicy/internal/expander/state_expander.go
@@ -81,24 +81,30 @@ func (c StateExpander) expandMap(mapState map[string]interface{}) (map[string]in
 }
 
 func (c StateExpander) expandString(stringState string) (interface{}, error) {
-	re := regexp.MustCompile(`^{{ (.*) }}$`)
+	re := regexp.MustCompile(`^{{ (.*) }}(\.[0-9]+)?$`)
 	submatch := re.FindStringSubmatch(stringState)
 
 	if len(submatch) == 0 {
 		return stringState, nil
 	}
 
-	const captureSubmatchLength = 2
+	const captureSubmatchLength = 3
 	if len(submatch) != captureSubmatchLength {
 		return nil, fmt.Errorf("the capture expression has wrong format %s", stringState)
 	}
 
 	capturePath := submatch[1]
+	suffix := submatch[2]
 	resolvedPath, err := c.capResolver.ResolveCaptureEntryPath(capturePath)
 
 	if err != nil {
 		return nil, err
 	}
 
+	switch captureValue := resolvedPath.(type) {
+	case string:
+		resolvedPath = captureValue + suffix
+	}
+
 	return resolvedPath, nil
 }