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POfind duplicate columns and replace matches with count
 

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  1. POfind duplicate columns and replace matches with count
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    <p>I have a tab delimited file which has duplicate named headings;</p> <pre><code>[Column1] \t [Column2] \t [test] \t [test] \t [test] \t [test] \t [Column3] \t [Column4] </code></pre> <p>What I want to do, is re-name the columns that are duplicated [test] with a integer. So would become something like</p> <pre><code>[Column1] \t [Column2] \t [test1] \t [test2] \t [test3] \t [test4] \t [Column3] \t [Column4] </code></pre> <p>So far, I can isolate the first row. Then count the matches I have found</p> <pre><code>string destinationUnformmatedFileName = @"C:\New\20130816_Opportunities_unFormatted.txt"; string destinationFormattedFileName = @"C:\New\20130816_Opportunities_Formatted.txt"; var unformattedFileStream = File.Open(destinationUnformmatedFileName, FileMode.Open, FileAccess.Read); // Open (unformatted) file for reading var formattedFileStream = File.Open(destinationFormattedFileName, FileMode.Create, FileAccess.Write); // Create (formattedFile) for writing StreamReader sr = new StreamReader(unformattedFileStream); StreamWriter sw = new StreamWriter(formattedFileStream); int rowCounter = 0; // Read each row in the unformatted file while ((currentRow = sr.ReadLine()) != null) { //First row, lets check for duplicate names if (rowCounter = 0) { // Write column name to array string delimiter = "\t"; string[] fieldNames = currentRow.Split(delimiter.ToCharArray()); foreach (string fieldName in fieldNames) { // fieldName must be followed by a tab for it to be a duplicate // original code - causing the issue //Regex rgx = new Regex("\\t(" + fieldName + ")\\t"); // Edit - resolved the issue Regex rgx = new Regex("(?&lt;=\\t|^)(" + fieldName + ")(\\t)+"); // Count how many occurances of fieldName in currentRow int count = rgx.Matches(currentRow).Count; //MessageBox.Show("Match Count = " + count.ToString()); // If we have a duplicate field name if (count &gt; 1) { string newFieldName = "\t" + fieldName + count.ToString() + "\t"; //MessageBox.Show(newFieldName); currentRow = rgx.Replace(currentRow, newFieldName, 1); } } } rowCounter++; } </code></pre> <p>I think I'm on the right track, but I don't think the regex's are working correctly?</p> <p>Edit: I think I have figured out how to find the pattern with using;</p> <pre><code>Regex rgx = new Regex("(?&lt;=\\t|^)(" + fieldName + ")(\\t)+"); </code></pre> <p>Its not a deal breaker, but only problem now is that it labels;</p> <pre><code>[Column1] \t [Column2] \t [test4] \t [test3] \t [test2] \t [test] \t [Column3] \t [Column4] </code></pre> <p>Instead of</p> <pre><code>[Column1] \t [Column2] \t [test1] \t [test2] \t [test3] \t [test4] \t [Column3] \t [Column4] </code></pre>
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    1. USJohn Saunders
    1. USChris Hillman
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      1. VTUpMod
    1. CO"I don't think the regex's are working correctly" sounds like you're not even sure whether there's a problem at all. What's not working? Do you get exceptions? Wrong results? No results? Also, you might want to use verbatim strings for your patterns to avoid double escaping: `@"\t(`. Secondly, you should probably run `fieldName` through `Regex.Escape()` before concatenating it into a pattern, because it could potentially contain metacharacters.
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      1. USMartin Ender
    2. CORegarding your edit. If that fixes it then the problem was that matches can never overlap. Since you required a `\t` before and after your field name, matches of adjacent fields would overlap. The lookaround is a good fix for that. Also, please post your solution as an answer (and accept it if you don't get a better one).
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      1. POfind duplicate columns and replace matches with count
      1. USMartin Ender
    3. COThanks m.buettner - I have posted answer but need to wait 2 days to accept it. Feel bad now wasting peoples time should of waited a bit longer and researched a bit more. Thanks for help!
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      1. USChris Hillman
 

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