Searching for group of letters in a structure or character string

Hi all,

I am working with a structure that contains various pieces of mixed data and having trouble sifting through it to find necessary pieces of info. For example, Structure(1).field contains eth:ip:udp:dns and Structure(169).field contains eth:ip:tcp.

I would like to efficiently find, for example, all elements that contain tcp.

If anyone could help out I would really appreciate it.

Thanks, Adam

Answer 1

[Oleg Komarov]

Suppose your structure is:

S(1).field = 'eth:ip:udp:dns';
S(2).field = 'eth:ip:tcp';
S(3).field = 'eth:ip';

idx = ~cellfun('isempty',strfind({S.field},'tcp'));
S(idx)

[Adam Clark]

Perfect, this is exactly what I was looking for.

Answer 2

[Jacob Halbrooks]

I would suggest you write a single-input function that takes a struct and returns whether that struct contains "tcp". Once you have such a function, use ARRAYFUN on your struct array to return a logical mask of the structs that contain the data you want, and use logical indexing to filter your array. For example:

dummyData = [struct('f','eth:ip:udp:dns')  struct('f','eth:ip:tcp')];
testFcn = @(x)~isempty(strfind(x.f,'tcp'));
filteredData = dummyData(arrayfun(testFcn, dummyData))

[Adam Clark]

Thank you so much.