Extracting number from a string

Hi, I want to extact the number from this string.

res_str ='TotalPower:9,7406E+00Watts'

I used below to find the index of the semi-colon, but how can I get the number from this format?

index = strfind(res_str, ':')-1
theNumber = str2double(res_str(index:21)) % - gives just NAN

Want to find the number positions (the start and end of the number, i.e. pos 12 and 21 in this case) and convert this to a number 9.7406E00

theNumber = (res_str(12:21))

theNumber =

    '9,7406E+00'
    
    

Many thanks

Answer 1

[Stephen23]

str = 'TotalPower:9,7406E+00Watts';
num = sscanf(strrep(str,',','.'),'%*[^:]:%f')

num = 9.7406

[captainmariah]

Thank you, I managed to get the number after some fail and trial, but its not as sleek as this code. My attempt.

        index1 = strfind(res_str, ':')+1;
        index2 = strfind(res_str, 'W')-1;
        theNumber = res_str(index1:index2);
        totalPower=str2double(theNumber);
        

What does this part do?

        %*[^:]:%f

[Stephen23]

"What does this part do?"

That defines the format for extracting data from the string: read the sscanf documentation to know more.

...    %*[^:]:%f     Three distinct parts of the format string:
...    %*[^:]        Read and discard all non-colon characters
...          :       Literal colon character
...           %f     Read number, including optional exponent