How can I read in a number from a file name?

In my program the user selects a dicom file and I need to know a number that is contained within the file name.

For example, the file name could be "Image10_processed.dcm", and I want to take the 10 so I can use that to find the corresponding info in another file.

Is there a way that I can break the file name down and just take the number? I've looked elsewhere and there seems to be no simple solutions.

Any help is much appreciated.

Answer 1

[Shruti Sapre]

Hi Jack,

If you are storing the name of the file as a string, you can do something like this:

>>startIndex = sscanf(str, 'Image%d');

(I am assuming that the file name beings with "Image" here)

http://www.mathworks.com/help/matlab/ref/sscanf.html

You could also use "regexp":

>>str='Image10_processed.dcm' 
>>expression = '[0-9]'; 
>>str(startIndex)

http://www.mathworks.com/help/matlab/ref/regexp.html

Hope this helps!

-Shruti

[Jack Miskell]

Thank you for your help Shruti.

In the end I used regexp.

Thanks again!

Jack