From 3e8098d4274b5f00585c201b57bc7165f02c3218 Mon Sep 17 00:00:00 2001
From: sebres <serg.brester@sebres.de>
Date: Tue, 30 Jan 2018 15:10:17 +0100
Subject: [PATCH] python 3.x compatibility: fix replacement string (may fail
 with errors like `bad escape \d ...`, etc)

---
 fail2ban/server/datetemplate.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fail2ban/server/datetemplate.py b/fail2ban/server/datetemplate.py
index 4c9bb4e37..cd4592c77 100644
--- a/fail2ban/server/datetemplate.py
+++ b/fail2ban/server/datetemplate.py
@@ -204,7 +204,7 @@ class DateEpoch(DateTemplate):
 			self.name = "LongEpoch";
 			epochRE = r"\d{10,11}(?:\d{3}(?:\d{3})?)?"
 		if pattern:
-			regex = RE_EPOCH_PATTERN.sub("(%s)" % epochRE, pattern)
+			regex = RE_EPOCH_PATTERN.sub(lambda v: "(%s)" % epochRE, pattern)
 			self.setRegex(regex)
 		elif not lineBeginOnly:
 			regex = r"((?:^|(?P<square>(?<=^\[))|(?P<selinux>(?<=\baudit\()))%s)(?:(?(selinux)(?=:\d+\)))|(?(square)(?=\])))" % epochRE