Regex negative on string

Question

How can I get the negative of the result of this regex?

8000[0-9]{12}|4000[0-9]{12}|2000[0-9]{11}

I just want to modify the regex to get the negative.

Example with this sample:

200045646587982  
8000046678465132  
8000078526654112  
4000846464256741  
4000875465123111  
8318548479844423  
8020489065458054

If I execute the current regex, I get that result:

200045646587982  
8000046678465132  
8000078526654112  
4000846464256741  
4000875465123111

I want the regex returns the reverse:

8318548479844423  
8020489065458054

By negative do you mean inverse?

Quintin Robinson
– Quintin Robinson

2012-11-08 16:09:49 +00:00
Commented Nov 8, 2012 at 16:09 — Quintin Robinson
– Quintin Robinson, Commented Nov 8, 2012 at 16:09
So you want to match, when this pattern doesn't?

Martin Ender
– Martin Ender

2012-11-08 16:17:24 +00:00
Commented Nov 8, 2012 at 16:17 — Martin Ender
– Martin Ender, Commented Nov 8, 2012 at 16:17

Uluaiv · Accepted Answer · 2012-11-15 14:18:07Z

2

it depends on what tools you can use.

I would take my input and use the "positive" regexp to replace the matching lines with empty strings and then getting rid of them.

For instance, if your input is a file and you are working in an Unix environment:

cat input.txt | sed s/my-positive-regexp//g

would replace the matching strings with empty strings.

edited Nov 15, 2012 at 14:18

answered Nov 15, 2012 at 12:46

Uluaiv

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Community · Accepted Answer · 2017-05-23 11:56:10Z

0

View my answer here: https://stackoverflow.com/a/12139118/1548853

Even though the answer is not directed towards you entirely, the same principle applies.

edited May 23, 2017 at 11:56

CommunityBot

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answered Nov 8, 2012 at 16:25

Firas Dib

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Comments

paparazzo · Accepted Answer · 2012-11-08 17:09:18Z

0

I think this is simpler than inverting / negating the pattern.

    if (!Regex.IsMatch("input", "pattern")) 
    {
    }

answered Nov 8, 2012 at 17:09

paparazzo

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2 Comments

Dan Over a year ago

I know how to do that in c# and it is easy but I need to modify the regex expression to get the reverse of my current result.

paparazzo Over a year ago

No you don't "need to". You could just read the data line by line.

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