regex - Read fields from text file and store them in a structure -

i trying read file looks follows:

data sampling rate: 256 hz *************************  channels in edf files: ********************** channel 1: fp1-f7 channel 2: f7-t7 channel 3: t7-p7 channel 4: p7-o1  file name: chb01_02.edf  file start time: 12:42:57  file end time: 13:42:57   number of seizures in file: 0  file name: chb01_03.edf  file start time: 13:43:04  file end time: 14:43:04  number of seizures in file: 1  seizure start time: 2996 seconds  seizure end time: 3036 seconds 

so far have code:

fid1= fopen('chb01-summary.txt') data=struct('id',{},'stime',{},'etime',{},'seizenum',{},'sseize',{},'eseize',{}); if fid1 ==-1     error('file cannot opened ') end tline= fgetl(fid1); while ischar(tline)     i=1;     disp(tline); end 

i want use regexp find expressions , did:

line1 = '(.*\d{2} (\.edf)'  data{1} = regexp(tline, line1); tline=fgetl(fid1); time = '^time: .*\d{2]}: \d{2} :\d{2}' ; data{2}= regexp(tline,time); tline=getl(fid1); seizure = '^file: .*\d'; data{4}= regexp(tline,seizure); if data{4}>0     stime = '^time: .*\d{5}';      tline=getl(fid1);     data{5}= regexp(tline,seizure);     tline= getl(fid1);     data{6}= regexp(tline,seizure); end 

i tried using loop find line @ file name starts with:

for (firstline<1) || (firstline>1 )     firstline= strfind(tline, 'file name')      tline=fgetl(fid1); end  

and i'm stumped.

suppose @ line @ information there, how store information regexp? got empty array data after running code once...

thanks in advance.

i find easiest read lines cell array first using textscan:

%// read lines strings fid = fopen('input.txt', 'r'); c = textscan(fid, '%s', 'delimiter', '\n'); fclose(fid); 

and apply regexp on rest of manipulations:

%// parse field names , values c = regexp(c{:}, '^\s*([^:]+)\s*:\s*(.+)\s*', 'tokens'); c = [c{:}];                          %// flatten cell array c = reshape([c{:}], 2, []);          %// reshape name-value pairs 

now have cell array c of field names , corresponding (string) values, , have plug struct in correct syntax (using comma-separated list in case). note field names have spaces in them, needs taken care of before can used (e.g replace them underscores):

c(1, :) = strrep(c(1, :), ' ', '_'); %// replace spaces underscores data = struct(c{:}); 

here's input file:

data =              data_sampling_rate: '256 hz'                      channel_1: 'fp1-f7'                      channel_2: 'f7-t7'                      channel_3: 't7-p7'                      channel_4: 'p7-o1'                      file_name: 'chb01_03.edf'                file_start_time: '13:43:04'                  file_end_time: '14:43:04'     number_of_seizures_in_file: '1'             seizure_start_time: '2996 seconds'               seizure_end_time: '3036 seconds' 

of course, possible prettify more converting relevant numbers numerical values, grouping 'channel' fields , such, i'll leave you. luck!