Extract Numbers from Mixed string

Question

Jason 2024-2-9

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2080206-extract-numbers-from-mixed-string

评论： Jason 2024-2-9

采纳的回答： Hassaan

在 MATLAB Online 中打开

Hello, I have this string

'single snap detector: 1 S2L:232867 S2R:3151621 S3L:0 S3R:0'

Whats the best way to get the 4 numbers and then the S2R - S2L value?

I have tried this:

B='single snap detector: 1 S2L:232867 S2R:3151621 S3L:0 S3R:0'
pat=regexpPattern("S2L:[/d]")
extract(B,pat)

But Im getting an empty array

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Jason 2024-2-9

在 MATLAB Online 中打开

Actually, this seems to work not sure if its th e best way:

sscanf(B,'single snap detector: 1 S2L:%d S2R:%d S3L:%d S3R:%d')
ans =
232867
3151621
0
0

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Hassaan 2024-2-9

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2080206-extract-numbers-from-mixed-string#answer_1405531

在 MATLAB Online 中打开

% Your input string
B = 'single snap detector: 1 S2L:232867 S2R:3151621 S3L:0 S3R:0';
% Regular expression pattern to match the labels and their corresponding values
pattern = 'S2L:(\d+) S2R:(\d+) S3L:(\d+) S3R:(\d+)';
% Using regexp to find the matches and extract the numbers
tokens = regexp(B, pattern, 'tokens');
% tokens{1} will contain a cell array of the matched groups if a match is found
if ~isempty(tokens)
    % Converting the extracted strings to numbers
    numbers = str2double(tokens{1});
    S2L = numbers(1);
    S2R = numbers(2);
    S3L = numbers(3);
    S3R = numbers(4);
    
    % Calculate S2R - S2L
    difference = S2R - S2L;
else
    S2L = NaN;
    S2R = NaN;
    S3L = NaN;
    S3R = NaN;
    difference = NaN;
end
% Displaying the results
S2L, S2R, S3L, S3R, difference
S2L = 232867
S2R = 3151621
S3L = 0
S3R = 0
difference = 2918754

-----------------------------------------------------------------------------------------------------------------------------------------------------

If you find the solution helpful and it resolves your issue, it would be greatly appreciated if you could accept the answer. Also, leaving an upvote and a comment are also wonderful ways to provide feedback.

It's important to note that the advice and code are based on limited information and meant for educational purposes. Users should verify and adapt the code to their specific needs, ensuring compatibility and adherence to ethical standards.

A multiverse of answers and solutions.

Professional Interests

Technical Services and Consulting
Embedded Systems | Firmware Developement | Simulations
Electrical and Electronics Engineering

Feel free to contact me.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

Answer 2

Vaibhav 2024-2-9

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2080206-extract-numbers-from-mixed-string#answer_1405536

编辑：Vaibhav 2024-2-9

在 MATLAB Online 中打开

Hi Jason

You can consider using the below regular expression to extract the required values.

'S2L:(\d+) S2R:(\d+) S3L:(\d+) S3R:(\d+)'

Hope this helps!

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

Answer 3

Stephen23 2024-2-9

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2080206-extract-numbers-from-mixed-string#answer_1405541

编辑：Stephen23 2024-2-9

在 MATLAB Online 中打开

B = 'single snap detector: 1 S2L:232867 S2R:3151621 S3L:0 S3R:0';

Method one: SSCANF:

V = sscanf(B,'%*[^:]:%d') % very efficient
V = 5×1
           1
      232867
     3151621
           0
           0

Method two: REGEXP (could also be EXTRACT):

T = regexp(B,'(S\w+):(\d+)','tokens');
T = vertcat(T{:}) % all relevant parts
T = 4×2 cell array
    {'S2L'}    {'232867' }
    {'S2R'}    {'3151621'}
    {'S3L'}    {'0'      }
    {'S3R'}    {'0'      }
V = str2double(T(:,2))
V = 4×1
      232867
     3151621
           0
           0

3 个评论
显示 1更早的评论隐藏 1更早的评论

Stephen23 2024-2-9

@Jason: if you need only the numeric values and want efficient code then you won't get faster than the SSCANF call I showed you.

Jason 2024-2-9

Yeah thats what Im actually using :-), thankyou!

请先登录，再进行评论。

Answer 4

Mathieu NOE 2024-2-9

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2080206-extract-numbers-from-mixed-string#answer_1405551

在 MATLAB Online 中打开

hello

i supposed you wanted to do this :

B='single snap detector: 1 S2L:232867 S2R:3151621 S3L:0 S3R:0'
B = 'single snap detector: 1 S2L:232867 S2R:3151621 S3L:0 S3R:0'
% pat=regexpPattern("S2L:[/d]")
pat=regexpPattern("S2L:[\d]")
pat = pattern
  Matching:

    regexpPattern("S2L:[\d]")
extract(B,pat)
ans = 1×1 cell array
    {'S2L:2'}

my2 cents suggestion to extract all numbers present in this char array (up to you to pick the ones you are intersted in);

B='single snap detector: 1 S2L:232867 S2R:3151621 S3L:0 S3R:0'
B = 'single snap detector: 1 S2L:232867 S2R:3151621 S3L:0 S3R:0'
C = regexp(B,'\d+(\.)?(\d+)?','match');
% convert string to num array
for ci = 1:numel(C)
    out(ci,:) = str2double(C{ci});
end
out
out = 9×1
           1
           2
      232867
           2
     3151621
           3
           0
           3
           0