diff --git a/README.md b/README.md
index d56493f..6e923b6 100644
--- a/README.md
+++ b/README.md
@@ -46,7 +46,7 @@
 }
 ```
 ##### Требования к валидации:
-* login: 3-50 символов, [a–z0–9._-], уникальное значение
+* login: 3-50 символов, ^[A-Za-z0-9_]+$, уникальное значение
 * password: ≥ 5 символов
 
 ##### Response - 201 - Created
diff --git a/src/endpoints_handlers/AuthRegistrationExecutor.h b/src/endpoints_handlers/AuthRegistrationExecutor.h
index fc65224..16a9c41 100644
--- a/src/endpoints_handlers/AuthRegistrationExecutor.h
+++ b/src/endpoints_handlers/AuthRegistrationExecutor.h
@@ -115,7 +115,7 @@ private:
   {
     if (login.size() < 3 || login.size() > 50) return false;
 
-    std::regex pattern("[a–z0–9._-]");
+    std::regex pattern(std::string("^[A-Za-z0-9_]+$"));
 
     return std::regex_match(login, pattern);
   }