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Multiline trigger question

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Posted by Poromenos   Greece  (1,037 posts)  [Biography] bio
Date Tue 15 Jun 2004 07:04 PM (UTC)
Message
I'm a bit confused at this one. I want to match on:

Exits: north south

<13hp>

but not
Exits: north south
Someone is standing here.

<13hp>

I don't want to use the prompt to match, so I thought I could make a multiline trigger that matches on:
^Exits\: (.*?)\.\n\z
But it matches in both cases. How can I make it match on Exits: * and then an empty line?
Vidi, Vici, Veni.
http://porocrom.poromenos.org/ Read it!
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Posted by Nick Gammon   Australia  (23,042 posts)  [Biography] bio   Forum Administrator
Date Reply #1 on Tue 15 Jun 2004 11:48 PM (UTC)
Message
The simple solution is to add the extra newline, like this:


^Exits\: (.*?)\n\n\z


Thus, it looks for 2 newlines (because one blank line consists of 2 consecutive newlines).

A more complex method might be to use a "lookahead assertion" to check that the next line does *not* start with "Someone is standing here.", if that is the only case you want to exclude.
- Nick Gammon

www.gammon.com.au, www.mushclient.com
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Posted by Poromenos   Greece  (1,037 posts)  [Biography] bio
Date Reply #2 on Wed 16 Jun 2004 12:35 AM (UTC)
Message
Ahh great, thanks... Why doesn't ^Line1$\n^$ do what I expected though?
Vidi, Vici, Veni.
http://porocrom.poromenos.org/ Read it!
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Posted by Nick Gammon   Australia  (23,042 posts)  [Biography] bio   Forum Administrator
Date Reply #3 on Wed 16 Jun 2004 06:16 AM (UTC)
Message
I'm not sure - I had some problems myself with things like ^ and $ in multi-line triggers.

Maybe ^Line1$^$ would work but I wouldn't bet on it.
- Nick Gammon

www.gammon.com.au, www.mushclient.com
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