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Help with regex in config change detection

Hello all,

I've problem building regex filters that would successfully ignore following lines:

Case 1. "!" in After config, nothing in Before

Before:<empty>

After: !

Case 2. nothing in before config, text in after config

Before:<empty>

After: !Startup config saved at: Thu Jul 5 09:15:37 2012

Any help would be appreciated.

Thanks, MSM