From 40109946f627e597f58294a8b76482812306b000 Mon Sep 17 00:00:00 2001
From: Julian Gentges <13141309+gentges@users.noreply.github.com>
Date: Fri, 17 Apr 2026 22:34:37 +0200
Subject: [PATCH] Improve regex pattern for parsing ban entries

Adjusted the whitespace handling in the first part of the regex and allowed for negative numbers in the ban duration part.
---
 fail2ban-client/fail2ban-client.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fail2ban-client/fail2ban-client.go b/fail2ban-client/fail2ban-client.go
index a1a7a4a..01d63bf 100644
--- a/fail2ban-client/fail2ban-client.go
+++ b/fail2ban-client/fail2ban-client.go
@@ -250,7 +250,7 @@ func (f2bc *Fail2BanClient) GetBanned(jailName string) (*JailEntry, error) {
 			for index := 0; index < banListLen; index++ {
 				if listEnty, listEntyOk := banList.Get(index).(string); listEntyOk {
 					log.Tracef("GetBanned: Parsing ban entry: %s", listEnty)
-					re := regexp.MustCompile(`^(\d{1,3}(?:\.\d{1,3}){3}) \t(\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}) \+ (\d+) = (\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2})$`)
+					re := regexp.MustCompile(`^(\d{1,3}(?:\.\d{1,3}){3})[ \t]+(\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}) \+ (-?\d+) = (\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2})$`)
 
 					matches := re.FindStringSubmatch(listEnty)
 					if matches == nil {