From c0d82d86246c1bb5bfe8c06534234a6f28984921 Mon Sep 17 00:00:00 2001
From: Alex Tremblay <alex.tremblay@utoronto.ca>
Date: Tue, 27 May 2025 17:45:16 -0400
Subject: [PATCH] add matched error message to ConfigInvalidException message

---
 netmiko/base_connection.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/netmiko/base_connection.py b/netmiko/base_connection.py
index 690a6c72d..9f7bf5deb 100644
--- a/netmiko/base_connection.py
+++ b/netmiko/base_connection.py
@@ -2343,8 +2343,10 @@ def send_config_set(
                 )
 
                 if error_pattern:
-                    if re.search(error_pattern, output, flags=re.M):
-                        msg = f"Invalid input detected at command: {cmd}"
+                    error_match = re.search(error_pattern, output, flags=re.M)
+                    if error_match:
+                        error_msg = error_match.group(0)
+                        msg = f"Invalid input detected at command: {cmd}, matched error: {error_msg}"
                         raise ConfigInvalidException(msg)
 
         if exit_config_mode: