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read data formatted like ip address from a text file

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Hessa saad
Hessa saad on 28 Mar 2018
Commented: Hessa saad on 28 Mar 2018
I want to read a file formatted like this :
256.13.34.14: 257.13.34.15 221.18.87.18 266.13.77.19
257.13.34.15: 256.13.34.14 221.18.87.18
into a matrix like this:
256.13.34.14 257.13.34.15 221.18.87.18 266.13.77.19
257.13.34.15 256.13.34.14 221.18.87.18 0
  5 Comments
Hessa saad
Hessa saad on 28 Mar 2018
no, I want the whole IP to be stored in the matrix, and yes it will be a string array since I can not store the IP as double.

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Accepted Answer

Elias Gule
Elias Gule on 28 Mar 2018
Assuming that you want to store the data as strings, and that the delimiters are 'whitespace' and ':'.
filepath = 'the_path_to_your_file.txt';
str = fileread(filepath);
cstr= splitlines(str);
cstr = cstr(~cellfun('isempty',cstr)); % Remove all empty line data
ips = regexp(cstr,'(\d+\.?)+','match');
This should give you a cell array of cell arrays containing the defined ip's.

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