Extrapolate a specific group of numbers and letters from a "char" variable.

Hello everyone, I would like to extrapolate a specific group of numbers and letters from a "char" variable. Maybe this problem has already been solved but I couldn't find an answer anywhere.

My original char variable is:

20upg13 D112-A104 FH08547 P800 L0600@10000 a.csv

and I want to extrapolate "P800" and "L0600". By using the "strtok" command, I get what I want but if the variable is like this:

20upg13 P19 D112-A104 L02 FH08547 P800 L0600@10000 a.csv

my method doesn't work anymore.

I would like to know how do I tell Matlab to extrapolate the letter P followed by exactly three numbers (which can vary) and do the same for the letter L.

I attach the code I've used below. Thank you very much.

    % code
P = '\w*P\w*';
L = '\w*L\w*';
for i=1:nfiles    
        a = strrep(filelist(i).name,'_',' ');
        aa = strsplit(a);
        [token_P remain_P] = strtok(a, P);
        pp = strtok(remain_P);
        pp = strrep(pp,'P','');
        [token_L remain_L] = strtok(a, L);
        ll = strrep(remain_L,'@',' ');
        ll = strtok(ll);
        ll = strrep(ll,'L0','');
        Outnames = aa;
        Pres = pp;
        Lift = ll;
end

Answer 1

[Stephen23]

>> fmt = '.*(P\d{3}).*(L\d{4}).*';
>> regexp('20upg13 D112-A104 FH08547 P800 L0600@10000 a.csv',fmt,'tokens','once')
ans = 
    'P800'    'L0600'
>> regexp('20upg13 P19 D112-A104 L02 FH08547 P800 L0600@10000 a.csv',fmt,'tokens','once')
ans = 
    'P800'    'L0600'

[Francesca Guardavaccaro]

Thanks, it was very helpful!

Answer 2

[Walter Roberson]

regexp(STRING, 'P\d\d\d', 'match')