How to read the PRE html tags and replace some white spaces

Question

Stefano 2014-6-20

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评论： Stefano 2014-6-23

I read data from html file and delimmited by the following tags

<pre>
  12.0  29132  -60.3  -91.4      1   0.01    260         753.2  753.3  753.2
  10.0  30260  -57.9             1   0.01    260     58  802.4  802.5  802.4
  9.8   30387  -57.7  -89.7      1   0.01    261     61  807.8  807.9  807.8
  6.0   33631  -40.4  -77.4      1   0.17    260     88 1004.0 1006.5 1004.1
  5.9  33746  -40.3  -77.3       1   0.17               1009.2 1011.8 1009.3
   </pre>
    by the code:
t = regexp(html, '<PRE[^>]*>(.*?)</PRE>', 'tokens');

where t is a cell of char

Well, now I am trying to replace blank space with NaN to obtain:

0  29132  -60.3  -91.4      1   0.01    260    Nan  753.2  753.3  753.2
0  30260  -57.9   Nan     1   0.01    260     58  802.4  802.5  802.4
8  30387  -57.7  -89.7      1   0.01    261     61  807.8  807.9  807.8
0  33631  -40.4  -77.4      1   0.17    260     88 1004.0 1006.5 1004.1
9  33746  -40.3  -77.3      1   0.17    NaN    NaN 1009.2 1011.8 1009.3

In this data set the columns are not always delimited by the same space and I do not know the lenght of the white spaces.

For example: in the last one line of my frist one data set there are two "empty places" that I would replace with 'NaN'. The position of all elements can't be changed (textscan function is dangerous I think)

Do you have any suggestion? Maybe I should to read the PRE tags by another way?

Thank you

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Answer 1

Cedric 2014-6-20

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https://ww2.mathworks.cn/matlabcentral/answers/136737-how-to-read-the-pre-html-tags-and-replace-some-white-spaces#answer_141845

编辑：Cedric 2014-6-21

I've got to run, but here is one way (I'll come back later to discuss further if needed).

EDIT: the first solution could not work, I will update it as soon as I have more information.

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Cedric 2014-6-21

编辑：Cedric 2014-6-21

在 MATLAB Online 中打开

Ok, this is a table with 7 characters fixed column width. So you can process it as follows

regexprep( content, ' {7}', ' NaN' )

where content is the token that is outputted by you first call to REGEXP. If you have more than 7 white spaces at the beginning of each line, e.g. because of HTML indentation, we can refine the pattern to exclude them. Just let me know.

Stefano 2014-6-23