How to get the value (number) that is in a string?

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Zineb EL MORCHID
Zineb EL MORCHID 2016-4-6
评论： Zineb EL MORCHID 2016-4-6
To lighten my question ,for exemple let's take d='1'; I want to increment 1 it to get 2 as result. So I tried to convert it to double by using double(d)+1; I got 50. Obviously '1' is 49 in double , same thing I got by using int8 . which function should I use to get 2 as result?

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Image Analyst
Image Analyst 2016-4-6
Like this:
doubleD = str2double(d);

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