Error "std::exception" with function textscan in Matlab 2013b

Question

i have a file Text.txt with following sepecified content:

 !typ truck,bus,car,motor,bicycle 
 !end typ 
 !allowed car,motor,bicycle
 !end allowed

I want to get the string "car,motor,bicycle" from the row "!allowed car,motor,bicycle". So I did these in MATLAB 2012b:

io_contents = fullfile( 'Text.txt'); % open Textfile
Text = fileread( io_contents ); % read the content of io_contents
Rowbegin = strfind(Text,'!allowed'); %find the beginn of the row  in  Text
Rowend = strfind(Text,'!end allowed')-4 ;  %find the end of the row in Text
Row = Text(Rowbegin:Rowend) 
String = textscan(Row,'!allowed%s ');   
String = String{1}{1} 

it should work in Matlab 2012b,but in matlab 2013b it shows this message:

Caught "std::exception" Exception message is: invalid string position 

at line 6 , where TEXTSCAN used is.

Could you tell me the reason, and how could I solve it. Is the an alternativ functioin for the function textscan ? Thanks a lot

Answer 1

Though I am not really convinced that this is related to the 2013b version, here is an alternate solution.

Replace the textscan line by this:

strrep(Row,'!allowed ','')

If you want to do more advanced things, you can look into regular expressions, but for matching a word in a string this is usually the easiest way. As a bonus it should be fairly efficient as well.

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It may also be possible to skip a step if you don't need the intermediate result of Row. In that case use:

String = Text(Rowbegin+9:Rowend)