diff --git a/frontend/src/lib/components/InputField.svelte b/frontend/src/lib/components/InputField.svelte
index cc84630..88a7315 100644
--- a/frontend/src/lib/components/InputField.svelte
+++ b/frontend/src/lib/components/InputField.svelte
@@ -17,6 +17,12 @@
   /** @type {string} */
   export let label = "";
 
+  /** @type {string} */
+  export let otherPasswordValue = "";
+
+  /** @type {boolean} */
+  export let toUpperCase = false;
+
   const dispatch = createEventDispatcher();
 
   /**
@@ -26,7 +32,11 @@
     const target = event.target;
 
     if (target instanceof HTMLInputElement) {
-      const inputValue = target.value;
+      let inputValue = target.value;
+      if (toUpperCase) {
+        inputValue = inputValue.toUpperCase();
+        target.value = inputValue; // Update the input field value
+      }
       value = inputValue;
       // dispatch("input", { name, value: inputValue });
     }
@@ -42,16 +52,40 @@
     switch (name) {
       case "first_name":
       case "last_name":
+      case "address":
+      case "city":
+      case "account_holder_name":
+      case "bank":
         return value.trim() ? null : $t("required");
+      case "birth_date":
+      case "membership_start_date":
+        return value.trim() ? null : $t("required_date");
       case "email":
         return /^\S+@\S+\.\S+$/.test(value) ? null : $t("invalid_email");
       case "password":
-        return !value.trim() || value.length >= 8
+      case "password2":
+        if (!value.trim()) {
+          return null;
+        }
+        if (value.length < 8) {
+          return $t("required_password");
+        }
+        if (otherPasswordValue && value !== otherPasswordValue) {
+          return $t("required_password_match");
+        }
+        return null;
+      case "phone":
+        return /^\+?[0-9\s()-]{7,}$/.test(value) ? null : $t("invalid_phone");
+      case "zip_code":
+        return /^\d{5}$/.test(value) ? null : $t("invalid_zip_code");
+      case "iban":
+        return /^[A-Z]{2}\d{2}[A-Z0-9]{1,30}$/.test(value)
           ? null
-          : $t("required_password");
-      // case "password2":
-      //   // Note: This case might need special handling as it depends on another field
-      //   return $t("required_password_match");
+          : $t("invalid_iban");
+      case "bic":
+        return /^[A-Z]{6}[A-Z2-9][A-NP-Z0-9]([A-Z0-9]{3})?$/.test(value)
+          ? null
+          : $t("invalid_bic");
       default:
         return null;
     }