[Remops] Regualr Expressions for whitelisting

[Stefan Claas]

On Tue, Jan 26, 2016 at 07:14:28PM +0000, Steve Crook wrote: 
> Hi Stefan,
> 
> Regexs are very powerful filtering tools, to explain them in detail here
> would be difficult.  Here's a very short summary of the format used in
> Mixmaster for white/blacklisting.
> 
> To match bob at domain.de:
> /bob\@domain\.de/
> The regex needs to be enclosed in /.../
> Special characters (@ and . in this case) need to be escaped with a
> preceeding backslash.
> 
> To match any user at domain.de:
> /domain\.de/
> The regex doesn't need to match from the beginning of a line so this
> will match bob at domain.de and also alice at foo.domain.de.
> 
> To match only sub-domains of domain.de:
> /\.domain\.de/
> This matches bob at sub.domain.de but not bob at domain.de.
> 
> In all the above instances, domain.de.com would also match because we
> didn't specify the regex must end with anything specific.  To match
> domain.de but not domain.de.com:
> /domain\.de$/
> The dollar symbol means match to end of a line.
> 
> To match people called bob at any domain:
> /^bob\@/
> The ^ symbol means match from the beginning.  In this instance, it
> prevents matching (for example) jimbob at domain.de.
> 
> There are virtually infinite possibilities with Regexs but this probably
> covers the bulk of options you're likely to want in a white/blacklist.
> 

Hi Steve,

thank you very much for the detailed explanation, which is very helpful
for me.

Best regards
Stefan

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