Can I use a regex in messagesize.rules

Ram ram at
Wed Jul 7 10:34:55 IST 2010

I have MailScanner version 4.70.7 on  CentOS 5.2 

If I have a rule in MailScanner messagesize like 

To: ram at 10000 
This works fine 

Some regular expressions  like these work too
To: ram@(mumbai\.)? 10000

But Expressions like these dont work 
To: ram@(.+\.)?

Are these regular expressions supported

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