Effacer les filtres
Effacer les filtres

How to filter set of strings with set of patterns?

31 vues (au cours des 30 derniers jours)
Robert Roos
Robert Roos le 11 Sep 2020
Commenté : Ameer Hamza le 11 Sep 2020
I have a list of strings:
names = {'Robert', 'Bob', 'Charles', 'James', 'Jamie', 'Marie', 'Jamesbob'}
That I want to filter with a set of regular expression patterns:
patterns = {'.*ob', 'jam.*'}
How can I a list of the names which match with at least one of the patterns? (Without getting duplicates and while keeping the original order)
So would expect an output like:
{'Robert', 'Bob', 'James', 'Jamie', 'Jamesbob'}
I can find matches with a single pattern like:
regex_matches = regexpi(names, pattern{1}, 'match')
Can have multiple patterns without using a loop?
And here `regex_matches` is a cellarray of cellarrays. How would I turn this into a single level list?
(This questions sounds failry general but I couldn't find a previous question. Apologies if there is one.)

Réponse acceptée

Ameer Hamza
Ameer Hamza le 11 Sep 2020
Modifié(e) : Ameer Hamza le 11 Sep 2020
Try this
names = {'Robert', 'Bob', 'Charles', 'James', 'Jamie', 'Marie', 'Jamesbob'};
patterns = {'.*ob', 'jam.*'};
regex_matches = cell(numel(patterns), numel(names));
for i=1:numel(patterns)
regex_matches(i, :) = regexpi(names, patterns{i}, 'match');
end
idx = any(~cellfun(@isempty, regex_matches));
matched_names = names(idx);
Result
>> matched_names
matched_names =
1×5 cell array
{'Robert'} {'Bob'} {'James'} {'Jamie'} {'Jamesbob'}
  2 commentaires
Robert Roos
Robert Roos le 11 Sep 2020
That is gorgeous, thank you!
Does this cover the unique part? If so could, could you briefly elaborate?
Ameer Hamza
Ameer Hamza le 11 Sep 2020
It first matches patterns{1} with the elements in name names, and then matches patterns{2} and then take logical or of both results. This approach keeps the order of names in the matched_names same as names.

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