Identify a number in a string

2020 10 11
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更新时间：2020 10 11
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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

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madhan ravi
madhan ravi 2020-10-11

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Wanted = str2double(regexp(Ans, '(+|-)?(\d+)?\.?\d*', 'match'))

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Ameer Hamza
Ameer Hamza 2020-10-11
编辑：Ameer Hamza 2020-10-11

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Try sscanf()
str = '2.66 meters in the front of the mirror';
nums = sscanf(str, '%f');
Result
>> nums
nums =
2.6600

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Omphemetse Moeng
Omphemetse Moeng 2020-10-11
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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