正则表达式搜索不包含一个单词的句子

Question

Ciao guys,

I'm creating a corpus composed with tweets that contain the keyword " catastrophic " in XML format. Each tweet are embedded like this:

<tweet>"Catastrophic loss" at Tennessee's Zoo Knoxville as 33 reptiles are found dead </tweet>
<tweet>Overcoming Catastrophic Forgetting by Incremental Moment Matching, Lee et al.</tweet

After trimming tons of unnecessary data, there are still like 200+ tweets that don't contain the keyword at all. I'd like to delete them, so I tried regex like this, but it just didn't work:

<tweet>^.*(?!catastrophic).*$</tweet>

Does anybody has any idea?

Answer 1

Not sure what programming language or other toolset you are using.

But a quite simple approach might be to re-write the file (or whatever kind of input it is) using a filter that only writes the entries that do contain catastrophic:

Assuming that it is a file with one line per tweet (just to illustrate the idea):

egrep '<tweet>.*catastrophic.*</tweet>' originalFile > newFile