Dear all,

I have a question need your help (POSIX regex). the question is shown as following.

There are several specified realms, and now there is a user which name likes abc@realm.com,

we should check if the realm of the use was not included in those realms.
Example:
The realms includes @cnn.com, @mil.gov, @blackberry.com, @yahoo.com and @abc.net, now there is a use user@realm.com,
I want to get the result that the realm of user@realm.com is not included in above realms.

Thanks.

Thanks.

Thanks.