Regex in syslog-ng

How can i filter the syslog record using regex ?

This is the filter condition that i was trying and cannot seem to get it working

filter f_proxyhosts { (host("^192\.68\.47\.121\smyhost0[1-9]|1[0-2]")) };

syslog-ng log

Feb  9 16:26:53 192.68.47.121 myhost01-server: #Version: 1.0_

What program are you using this regex with? Your program must support the PCRE form of regex for \s
In any case:

^192\.68\.47\.121\smyhost0[1-9]|1[0-2]

will not match

Feb 9 16:26:53 192.68.47.121 myhost01-server: #Version: 1.0_ 

This might:

192\.68\.47\.121\smyhost(0[1-9]|1[0-2])