ENH: make groupings non-capturing

config/filter.d/exim.conf

@@ -20,11 +20,11 @@ pid = ( \[\d+\])?
 
 failregex = ^%(pid)s %(host_info)ssender verify fail for <\S+>: (?:Unknown user|Unrouteable address|all relevant MX records point to non-existent hosts)\s*$
              ^%(pid)s \S+ F=(?:<>|\S+@\S+) %(host_info)s(?:temporarily )?rejected by local_scan\(\): .{0,256}$
-             ^%(pid)s login authenticator failed for (\S+ )?\(\S+\) \[<HOST>\]: 535 Incorrect authentication data( \(set_id=.*\)|: \d+ Time\(s\))?\s*$
+             ^%(pid)s login authenticator failed for (?:\S+ )?\(\S+\) \[<HOST>\]: 535 Incorrect authentication data(?: \(set_id=.*\)|: \d+ Time\(s\))?\s*$
-             ^%(pid)s %(host_info)sF=(?:<>|[^@]+@\S+) rejected RCPT [^@]+@\S+: (rejected found in dnsbl \S+|relay not permitted|Sender verify failed|Unknown user)\s*$
+             ^%(pid)s %(host_info)sF=(?:<>|[^@]+@\S+) rejected RCPT [^@]+@\S+: (?:rejected found in dnsbl \S+|relay not permitted|Sender verify failed|Unknown user)\s*$
              ^%(pid)s \S+ %(host_info)sF=(?:<>|[^@]+@\S+) rejected after DATA: This message contains a virus \(\S+\)\.\s*$
-             ^%(pid)s SMTP protocol synchronization error \(.*\): rejected (connection from|"\S+") %(host_info)s(next )?input=".*"\s*$
+             ^%(pid)s SMTP protocol synchronization error \(.*\): rejected (?:connection from|"\S+") %(host_info)s(?:next )?input=".*"\s*$
-             ^%(pid)s SMTP call from \S+ \[<HOST>\](:\d+)? (I=\[\S+\]:\d+ )?dropped: too many nonmail commands \(last was "\S+"\)\s*$
+             ^%(pid)s SMTP call from \S+ \[<HOST>\](:\d+)? (?:I=\[\S+\]:\d+ )?dropped: too many nonmail commands \(last was "\S+"\)\s*$
 
 # Option:  ignoreregex
 # Notes.:  regex to ignore. If this regex matches, the line is ignored.