using regexp for strings with space delimited inside text file

Question

sermet 2016-8-27

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/301106-using-regexp-for-strings-with-space-delimited-inside-text-file

编辑： per isakson 2016-8-27

I have a text file whose inside as follows;

ID:                         01
Eccentricity:               0.5846023560E-002
Time of Applicability(s):  405504.0000
Orbital Inclination(rad):   0.9652538155
Rate of Right Ascen(r/s):  -0.7828897534E-008
SQRT(A)  (m 1/2):           5153.587402
Right Ascen at Week(rad):   0.2494223175E+001
Argument of Perigee(rad):   0.529637577
Mean Anom(rad):             0.1359485230E+001

I can extract particular string without space inside text as follows (from Azzi Abdelmalek answer);

fid=fopen('data.txt')
s=fgetl(fid)
out={}
while ischar(s)
   out{end+1}=regexp(s,'(?<=(ID:))\s+\S+','match','once')
   s=fgetl(fid);
end
fclose(fid)
idx=~cellfun(@isempty,out);
out=strtrim(reshape(out(idx),1,[]))'

But when it comes to other strings with space delimited (Time of Applicability(s): and the others) above codes don't work. How can I modify above codes to work consistently with space delimited strings?

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Answer 1

per isakson 2016-8-27

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/301106-using-regexp-for-strings-with-space-delimited-inside-text-file#answer_232935

编辑：per isakson 2016-8-27

It seems that : can be used delimiter between "label" and value.

I would read this file with

    fid = fopen('data.txt');
    cac = textscan( fid, '%s%f', 'Delimiter',':', 'Whitespace','' );
    fclose(fid);

Inspect the result

>> cac{1}(3)
ans = 
    'Time of Applicability(s)'
>> cac{2}(3)
ans =
      405504

Your code will work if you replace

'(?<=(ID:))\s+\S+'

by

'(?<=(:))\s+\S+'

"work consistently with space delimited strings" &nbsp space shouldn't be a problem. However, the parentheses, (), requires an escape character, \( and \), respectively.