Cisco Cisco Email Security Appliance C160 Mode D'Emploi

Regular expressions can be tested for matching using the sequence 

==

 and for 

non-matching using the sequence 

!=

. For example: 

rcpt-to == "^goober@dev\\.null\\....$" (matching)

rcpt-to != "^goober@dev\\.null\\....$" (non-matching)

Unless otherwise noted, regular expressions are case-sensitive. Thus, if your 
regular expression is searching for 

foo

, it does not match the pattern 

FOO

 or even 

Foo

.