It's not working means I do not get any output when I print $msg, I expect it to print the actual string from log, I have mentioned this in my first post. Here is the log file inside code: 
20 Nov 17:43:1 10 28 2010 02:18:33: date=2010-10-28 time=00:27:54 log_
+id=2 type=ips subtype=signature pri=alert fwver=040002 severity=mediu
+m carrier_ep="N/A" profile="IPS" src=X.X.X.X dst=X.X.X.X src_int="wan
+1" dst_int="internal" policyid=2 status=detected proto=17 service=143
+4/udp vd="root" count=1 src_port=111 dst_port=80 attack_id=10328 sens
+or="IPS_sensor" ref="http://www.fortinet.com/ids/VID10328" user="N/A"
+ group="N/A" incident_serialno=2004954881 msg="database: MS.SQL.Serve
+r.Resolution.Service.Stack.Overflow"

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All other fields are matching and working fine except this one.
I tried debugging and regex matches the string but not when I run my perl script. 
  DB<10> $msg = q(some_fields msg="http_decoder: HTTP.Unknown.Tunnelli
+ng" some_fields)

  DB<11> x $ msg
0  'some_fields msg="http_decoder: HTTP.Unknown.Tunnelling" some_field
+s'
  DB<12> x $msg =~/msg=\"(.*?)\"/         
0  'http_decoder: HTTP.Unknown.Tunnelling'

  DB<13> x $msg =~ /msg=\"+((?:([^:,]+):\s|)([^,]+?)\s*(?:\s*,.*?|))\"
++/
0  'http_decoder: HTTP.Unknown.Tunnelling'
1  'http_decoder'
2  'HTTP.Unknown.Tunnelling'

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In reply to Re^4: Perl Regex by cipher
in thread Perl Regex by cipher

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