Identify a number in a string

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Hi all, I would like to know how to identify and extract a number or digit from a string or text, so if I have Ans = ['2.66 meters in the front of the mirror']; I would only like to identify and extract the double, this should be a general thing and not only specific to the 2.66. Please help

Accepted Answer

madhan ravi
madhan ravi on 11 Oct 2020
Wanted = str2double(regexp(Ans, '(+|-)?(\d+)?\.?\d*', 'match'))
  1 Comment
Omphemetse Moeng
Omphemetse Moeng on 11 Oct 2020
Thank you for this, it works.

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More Answers (1)

Ameer Hamza
Ameer Hamza on 11 Oct 2020
Edited: Ameer Hamza on 11 Oct 2020
Try sscanf()
str = '2.66 meters in the front of the mirror';
nums = sscanf(str, '%f');
Result
>> nums
nums =
2.6600
  1 Comment
Omphemetse Moeng
Omphemetse Moeng on 11 Oct 2020
Thank you, this only works if the number is placed first, so generally should its position in the string change it does not work anymore, I then get 0x0 double. Is there a more general way to this?

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