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Regular expressions Exclude patter

Posted on 2016-11-27
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Last Modified: 2016-11-27
I have a text .  I want to extract all phrases delimited by ? No problem

^?]+

But I need to exclude phrases with a certan word (f ex  monkey)

Example:

Central 543312,yrttt ?My firend? 23322 ?is a monkey?  ?I am happpy?

Extract my friend and I am happy

Do not extract is a monkey

Any ideas?
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Question by:robrodp
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3 Comments
 
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Accepted Solution

by:
Kim Ryan earned 2000 total points
ID: 41903357
Very hard to do this with a single regexp. As you have to keep looping around a string to find all the delimited sequences, I suggest a 2 stage approach
1. Get the delimited strings
2. Exclude matches with the excluded phrase

Here is a Perl example
my $a = 'Central 543312,yrttt ?My firend? 23322 ?is a monkey?  ?I am happpy?';
while ($a =~ /\?(.*?)\?/g) {
    push(@phrases,$1);
}
my @exclusions = ('monkey');
foreach $phrase (@phrases) {
    foreach $exclusion (@exclusions) {
        unless ($phrase =~ /$exclusion/) {
            print "$phrase\n";
        }    
    }
}

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Author Closing Comment

by:robrodp
ID: 41903361
Thx
0
 

Author Comment

by:robrodp
ID: 41903362
I had thought about that

However I was hoping there was a better solution

Thx
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