[Bro-Dev] #758: New function split_esc

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#758: New function split_esc
---------------------------+------------------------
 Reporter:  matthias       |      Owner:
     Type:  Merge Request  |     Status:  new
 Priority:  Normal         |  Milestone:
Component:  Bro            |    Version:  git/master
 Keywords:                 |
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 In the topic branch `topic/matthias/split-escaped`, I added new
 functionality to split strings that may contain an escaped split
 expression. E.g., now it would be possible to split strings of the form
 {{{
 a#b\#c#d
 }}}
 into `[a, b\#c, d]`. This would otherwise not be possible, because one
 cannot perform a lookahead with Bro's regular expressions.

 I implemented this function as an utility function at the scripting layer,
 rather than adding a new BiF. Ideally, we'd enhance `split_n` with this
 ability and then propagate the changes through the respective `split*`
 functions. But before this happens, it makes probably more sense to
 address #757 first.

-- 
Ticket URL: <http://tracker.bro-ids.org/bro/ticket/758>
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