[Bro] Bro regex documentation

[sridhar basam]

Can anyone point me at documentation on Bro's builtin string/pattern
functions? The reference manual on the wiki points me at strings.bif.bro
which doesn't have a lot of documentation around it.

Does bro support back-references? I am trying to look for specific patterns
in a tcp stream and need to be able to log out said patterns to a file.

thanks,
               Sridhar
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