Modify text in a column

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Marco Sette
Marco Sette 2019-6-26
评论： Walter Roberson 2019-6-26
Dear all, I want to modify just the first column of a file, removing the letters and keeping the numbers. The columns contain string like d200n-h. How it is possible?
Thanks,
Marco

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回答（1 个）

Walter Roberson
Walter Roberson 2019-6-26
编辑：Walter Roberson 2019-6-26
Assuming comma delimited:
S = fileread('YourFile.txt');
newS = regexprep(S, '^\D*(\d+)[^,]+(,.*$)', '$1$2', 'lineanchors', 'dotexceptnewline');
fid = fopen('YourNewFile.txt');
fwrite(fid, newS);
fclose(fid)
This should work even if there is "" around the string, but it will remove the "" if present.
  2 个评论
Marco Sette
Marco Sette 2019-6-26
Thanks but the third line seems to have some problem
Error: File: filter_first_column.m Line: 3 Column: 13
Invalid expression. Check for missing multiplication operator, missing or unbalanced
delimiters, or other syntax error. To construct matrices, use brackets instead of
parentheses.
-------
S = fileread('results1bar.txt');
newS = regexprep(S, '^\D*(\d+)[^,]+(,.*$)', '$1$2', 'lineanchors', 'dotexceptnewline');
fid = fopen'test.txt');
fwrite(fid, newS);
fclose(fid)

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