msgs not matching

I'm trying to get a match on a log file string but seem to be struggling. 

 
In my analysis.cfg I have the following, LOG /xymon/server/etc/test.log
"%Thread \"WebContainer.{1,75} and may be hung*" COLOR=yellow

 
On the msgs column on the relevant server I get,

 
No entries in /xymon/server/etc/test.log

 
No entries in /tmp/xymontest/ATPReceiptDiag.log

 
Full log /xymon/server/etc/test.log

Thread "WebContainer : 23" (0000006f) has been active for 686236
milliseconds and may be hung.

 
Full log /tmp/xymontest/ATPReceiptDiag.log

 
I've tested my string in my usual regular expression tester and it seems it
should work ok.

 
Is there something obvious that I've missed?