How can i extract the numbers from string?

Im trying to extract the numbers from a cell array? How can i do this?

cell array:

filename =

  1×12 cell array

  Columns 1 through 4

    {'104p8.png'}    {'105.png'}    {'105p2.png'}    {'105p4.png'}

  Columns 5 through 8

    {'105p6.png'}    {'105p8.png'}    {'106.png'}    {'106p2.png'}

  Columns 9 through 12

    {'106p4.png'}    {'106p6.png'}    {'106p8.png'}    {'107.png'}

Thanks

[Khushboo]

You can refer do it using regular expressions as mentioned here.

[Stephen23]

What exactly do you expect to be returned from e.g. '104p8.png':

[1,0,4,8]
[1,0,4]
[104,8]
1048
104

or something else... ?

[Happy PhD]

I expect to return the value: 104.8

p is '.'

[Marcel]

you might wanna update you question with this information

Answer 1

[Stephen23]

Here are two approaches:

C = {'104p8.png','105.png','105p2.png','105p4.png','105p6.png','105p8.png','106.png','106p2.png','106p4.png','106p6.png','106p8.png','107.png'}

C = 1×12 cell array
    {'104p8.png'}    {'105.png'}    {'105p2.png'}    {'105p4.png'}    {'105p6.png'}    {'105p8.png'}    {'106.png'}    {'106p2.png'}    {'106p4.png'}    {'106p6.png'}    {'106p8.png'}    {'107.png'}

V = str2double(strrep(strrep(C,'.png',''),'p','.'))

V = 1×12

104.8000 105.0000 105.2000 105.4000 105.6000 105.8000 106.0000 106.2000 106.4000 106.6000 106.8000 107.0000

V = str2double(regexprep(C,{'\.png$','p'},{'','.'},'ignorecase')) % more robust

V = 1×12

104.8000 105.0000 105.2000 105.4000 105.6000 105.8000 106.0000 106.2000 106.4000 106.6000 106.8000 107.0000

Answer 2

[Marcel]

Hi i made a test script and came up with the following code. I found a solution here

example = cellstr(["1024.png", "image1003.png", "photo-1234.png"])

for i=1:length(example)
    name = example{i};
    
    numbers = str2double(extract(name, digitsPattern))
end

example =

1×3 cell array

{'1024.png'} {'image1003.png'} {'photo-1234.png'}

numbers =

1024

numbers =

1003

numbers =

1234