As a few people already mentioned you need to anchor your pattern. Otherwise, 
.* might match what you want to exclude and attempt the match after it, 
resulting in an unwanted result.

What your regx is doing in words is this:

(.*) match anywhere
GUIDE_ : normal text match
(?!MIB) : immediately not followed by MIB
(.*) : match anywhere
(?!P4) : not followed by P4

Now, what you want to do if MIB and P4 can be anywhere after GUIDE_ is to match 
every character and the make sure it is not followed by any of those, up to the 
end. The regex for that would be:

(.*)GUIDE_(?:(?!MIB)(?!P4).)*$

The fancy part at the end translates into :

Make sure the following text is neither MIB or P4 when you try to match the 
next char, up to the end of string. it does not make a distinction weither MIB 
comes before or after P4. It will make sure any of those is not after GUIDE_

Richard Lavoie

> On 2014-09-19, at 03:38, Jan Seidel <wakkal...@gmail.com> wrote:
> 
> Hi all,
> 
> I have a weird issue with a regular expression.
> Hopefully you can help me out here.
> 
> I have a RegEx like (.*)GUIDE_(?!MIB)(.*)(?!P4)
> It should, as far as I can tell, list all jobs containing GUIDE but exclude 
> GUIDE jobs with a MIB in the middle or P4 at the end of the project name, 
> right?
> 
> My problem here is, that jobs with a P4 at the end still are listed :(
> 
> I have for testing purposes tried all kind of RegEx that crossed my mind but 
> without any success.
> Later I tried just to exclude job names with a P4 at the end. No joy
> 
> The RegEx I used was: (.*)GUIDE_(.*)(?!P4)
> The list is then completely emtpy.
> 
> Can someone tell me where I glitch?
> 
> Cheers
> Jan
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