how to remove values based on space delimiter

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the values present in my file is
f 1 2 3
f 1 2 3
f 1 2 3 4
f 2 3 4
f 4 5 6 7
i have to read every line and check for 4 values separated by space
ie f 1 2 3
if that line has 5 values the last value should get removed
ie
my output should be
f 1 2 3
f 1 2 3
f 1 2 3
f 2 3 4
f 4 5 6
does any built in is there ..pls help....thanks in advance

Accepted Answer

Walter Roberson
Walter Roberson on 24 Dec 2012
S = fileread('YourFileName.txt'); %read file
NewS = regexprep(S, '(?m)(?-s)^(\w+\s+\w+\s+\w+).*', '$1'); %do edit
fid = fopen('YourNewFile.txt, 'wt'); %write out new version
fwrite(fid, NewS);
fclose(fid);
  3 Comments
Walter Roberson
Walter Roberson on 24 Dec 2012
'(?m)(?-s)^(\w+\s+[0-9\\]+\s+[0-9\\]+).*'
This presumes that the first thing on the line will not be of the same form, and that the other values only have digits and backslash.

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