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Negative Lookahead (?!¤¤¤¤¤)

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Negative Lookahead (?!¤¤¤¤¤)

Post by Admin on Sun 16 Apr - 14:32

https://www.tvaddons.ag/forums/live-video-stream-link-sharing/17239-livestreams-xml-requests-2-a-1897.html#post411229

(?!unwanted)

This is used, for example, if you DON'T want that PLAYB0Y appears in the list ...
(?!PLAYB0Y)

Follow the link to get better examples ...

Admin

Messages : 33
Date d'inscription : 2017-03-28

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Re: Negative Lookahead (?!¤¤¤¤¤)

Post by twogun on Tue 18 Apr - 17:00

Aside from Negative Lookahead there is also the similar function negative Lookbehind.  The advantage is that it makes it easier to define the unwanted item when it is at the end of the capture group (or after the capture group).  example:

Code:
<expres>url="(http.+)(?<!m3u8)"</expres>

Code:
url="http://something.mp4"  #---->   http://something.mp4
url="http://something.mkv"  #---->   http://something.mkv
url="http://something.m3u8"  #--->  No Match

of course for this example you can get the same results using Negative lookahead like this:
Code:
<expres>url="(?!.+m3u8)(http.+)"</expres>
But there may be cases where Negative Lookbehind is the better solution.
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Date d'inscription : 2017-04-03

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