feat: allow upper case "umlaute"

service/account.go

@@ -2,7 +2,6 @@ package service
 
 import (
 	"fmt"
-	"regexp"
 
 	"spend-sparrow/db"
 	"spend-sparrow/log"
@@ -15,8 +14,6 @@ import (
 )
 
 var (
-	safeInputRegex = regexp.MustCompile(`^[a-zA-Z0-9äöüß -]+$`)
-
 	accountMetric = promauto.NewCounterVec(
 		prometheus.CounterOpts{
 			Name: "spendsparrow_account_total",

service/default.go

@@ -1,6 +1,13 @@
 package service
 
-import "fmt"
+import (
+	"fmt"
+	"regexp"
+)
+
+var (
+	safeInputRegex = regexp.MustCompile(`^[a-zA-Z0-9ÄÖÜäöüß -]+$`)
+)
 
 func validateString(value string, fieldName string) error {
 	if value == "" {