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read a particular string from a line in text file

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Lets say I have two lines in a text file like this:
The value of the number is 240.56 units.
The value of the number is 140.43 units.
I want to read only the values (240.56 and 140.43) from those lines. However there are many such lines in the similar format inside the text file. So i can't go by comparing string value and then read that value. How to read those dynamic values which are located in a sentence at a particular position. Any ideas ?

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Accepted Answer

Tom Wright
Tom Wright on 2 Sep 2015
Sounds like a regular expression is the way to go.
fid = fopen('YourFile.txt','rt');
expression = '([\d.]+)' % matches one or more digits and .
% a more advanced expression is (\d+(?:\.\d*)?|\.\d+)
while true
thisline = fgetl(fid);
value = regexp(thisline,exp,'match'); % perform the regular expression
value = value(0);
end

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