diff --git a/ChangeLog b/ChangeLog
index 3d9d1a96..5120c139 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -78,7 +78,7 @@ some obscure corner of the Internet.
    * filter.d/recidive -- support f2b syslog target and anchor regex at start
    * filter.d/mysqld-auth.conf - mysql can use syslog
    * filter.d/sshd - regex enhancements to support openssh-6.3. Closes Debian
-     bug #722970
+     bug #722970. Thanks Colin Watson for the regex analysis.
    * filter.d/wuftpd - regex enhancements to support pam and wuftpd. Closes
      Debian bug #665925
   Rolf Fokkens
diff --git a/config/filter.d/sshd.conf b/config/filter.d/sshd.conf
index be80b02f..d97fd675 100644
--- a/config/filter.d/sshd.conf
+++ b/config/filter.d/sshd.conf
@@ -14,7 +14,7 @@ _daemon = sshd
 
 failregex = ^%(__prefix_line)s(?:error: PAM: )?[aA]uthentication (?:failure|error) for .* from <HOST>( via \S+)?\s*$
             ^%(__prefix_line)s(?:error: PAM: )?User not known to the underlying authentication module for .* from <HOST>\s*$
-            ^%(__prefix_line)sFailed \S+ for .*? from <HOST>(?: port \d*)?(?: ssh\d*)?(: (ruser .{0,100}|(\S+ ID \S+ \(serial \d+\) CA )?\S+ %(__md5hex)s(, client user ".{0,100}", client host ".{0,100}")?))?\s*$
+            ^%(__prefix_line)sFailed \S+ for .*? from <HOST>(?: port \d*)?(?: ssh\d*)?(: (ruser .*|(\S+ ID \S+ \(serial \d+\) CA )?\S+ %(__md5hex)s(, client user ".*", client host ".*")?))?\s*$
             ^%(__prefix_line)sROOT LOGIN REFUSED.* FROM <HOST>\s*$
             ^%(__prefix_line)s[iI](?:llegal|nvalid) user .* from <HOST>\s*$
             ^%(__prefix_line)sUser .+ from <HOST> not allowed because not listed in AllowUsers\s*$
diff --git a/testcases/files/logs/sshd b/testcases/files/logs/sshd
index def0ebb5..4f862d89 100644
--- a/testcases/files/logs/sshd
+++ b/testcases/files/logs/sshd
@@ -95,6 +95,8 @@ Sep 29 17:15:02 spaceman sshd[12946]: Failed hostbased for dan from 127.0.0.1 po
 # failJSON: { "time": "2004-09-29T17:15:02", "match": true , "host": "127.0.0.1" }
 Sep 29 17:15:02 spaceman sshd[12946]: Failed hostbased for dan from 127.0.0.1 port 45785 ssh2: DSA 01:c0:79:41:91:31:9a:7d:95:23:91:ac:b1:6d:59:81, client user "dan", client host "localhost.localdomain"
 
-# Injecting into rhost for the format of OpenSSH >=6.3
-# failJSON: { "time": "2004-09-29T17:15:02", "match": true , "host": "127.0.0.1" }
+# failJSON: { "time": "2004-09-29T17:15:02", "match": true , "host": "127.0.0.1", "desc": "Injecting into rhost for the format of OpenSSH >=6.3" }
 Sep 29 17:15:02 spaceman sshd[12946]: Failed password for user from 127.0.0.1 port 20000 ssh1: ruser from 1.2.3.4
+
+# failJSON: { "time": "2004-09-29T17:15:02", "match": true , "host": "127.0.0.1", "desc": "Injecting while exhausting initially present {0,100} match length limits set for ruser etc" }
+Sep 29 17:15:02 spaceman sshd[12946]: Failed password for user from 127.0.0.1 port 20000 ssh1: ruser XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX from 1.2.3.4