separate data from file

I attached data file. data is in format of

source _ip:source_port->destination_ip:destination_port

I want to take out only source_ip data from that, how to do.

[KSSV]

No file attached..

[Jay Hanuman]

I forgot, now I attached

Answer 1

[KSSV]

load('n0 1.mat') ;
s = VarName6 ;
idx = strfind(s, ':');
idx = cell2mat(idx) ;
idx = idx(:,1)-1 ;
iwant = cellfun(@(x,idx) x(1:idx),s,num2cell(idx), 'UniformOutput', false) ;

Or

load('n0 1.mat') ;
s = VarName6 ;
s1 = regexp(s,':','split')  ;
iwant = cellfun(@(x) x{1}(:)',s1, 'UniformOutput', false) ;

Answer 2

[Walter Roberson]

regexp() probably

[Walter Roberson]

Or possibly strsplit