如何使用Matlab读取字符串中的数字

Question

I have a file with non standard format and i want to read specific parts of it, that consist of real or integer numbers.

str1='N.ELBETI.150.L10';

str2='KARDIA_3.150.L20';

str3='axeloos1.15.75.L20';

str4='florina2.6.3.L2.1';

i just want to store the numbers in the central part and at the end of each string, ie:

150 and 10 from str1, 150 and 20 from str2, 15.75 and 20 from str3, 6.3 and 2.1 from str4 i have tried several ways but i cannot. Can you help me ?

Answer 1

An alternative to the already posted, nice answer. Apply the following function to each string.

function [num1, num2] = extract_from_string(s)

num1 = str2num(s(find(s == '.',1,'first')+1:find(s == 'L',1,'first')-2));
num2 = str2num(s(find(s == 'L',1,'first')+1:end));

end

Answer 2

Use regexp like this:

To obtain the first number:

str1(regexp(str1,'\.\d')+1:regexp(str1,'L\d')-2)

To obtain the last number:

str1(regexp(str1,'L\d')+1:end)

These commands also work for the other strings