EXTRACT NUMBER FROM A COMBINED STRING AND NUMBERS

Question

Diego 2014-6-13

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评论： Diego 2014-6-13

I have for example the following string 'mario5.png' or 'Julian15.png' and want to extract the numbers from there in the first case 5 in the second case 15. Can anyone tell me which function to look for?

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Answer 1

Dishant Arora 2014-6-13

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String = 'mario5.png';
output = String(regexp(String , '[0-9]'));

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Diego 2014-6-13

but what if the nomber is bigger than 10 will this work?

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Answer 2

David Sanchez 2014-6-13

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use str2double to get it in double format:

output = str2double(String(regexp(String , '[0-9]')))
output =
       5

otherwise your output will be a string.

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Answer 3

Brian B 2014-6-13

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编辑：Brian B 2014-6-13

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If the number is bigger than 9, you can make a slight modification to the answer by David Sanchez:

output = str2double(String(regexp(String , '[0-9]+')))

This will work for positive integers. The "+" means "one or more". You can also skip a step by requesting that regexp return the matching part of the string instead of the index of the match:

output = str2double(regexp(String , '[0-9]+', 'match'))