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copied!<p>My program first breaks the text into batches.</p> <p>I think you'll agree that resequencing the detail number is the trickiest part. You can do it with a MatchEvaluator delegate.</p> <pre><code>Regex.Replace ( text, // the text replace part of @"(?<=^DETAIL)\d+", // the regex pattern to find. m => (detailNum++).ToString ("000"), // replacement (evaluated for each match) RegexOptions.Multiline); </code></pre> <p>See how the preceeding code increments <code>detailNum</code> at the begining of each batch.</p> <pre><code> var contents = @"FILE001DETAILCOUNT002 BATCH01 DETAIL001FOO BATCH02 DETAIL001BAR"; // foreach batch.... foreach (Match match in Regex.Matches (contents, @"BATCH\d+\s+(?:(?!BATCH\d+).*\s*)+")) { Console.WriteLine ("==============\r\nFile\r\n================"); int batchNum = 1; int detailNum = 1; StringBuilder temp = new StringBuilder (); TextWriter file = new StringWriter (temp); // Your file here instead of my stringBuilder/StringWriter string batchText = match.Value; int count = Regex.Matches (batchText, @"^DETAIL\d+", RegexOptions.Multiline).Count; file.WriteLine ("FILE001DETAILCOUNT{0:000}", count); string newText = Regex.Replace (batchText, @"(?<=^BATCH)\d+", batchNum.ToString ("000"), RegexOptions.Multiline); newText = Regex.Replace ( newText, @"(?<=^DETAIL)\d+", m => (detailNum++).ToString ("000"), // replacement (evaluated for each match) RegexOptions.Multiline); file.Write (newText); Console.WriteLine (temp.ToString ()); } </code></pre> <p>prints</p> <pre><code>============== File ================ FILE001DETAILCOUNT001 BATCH001 DETAIL001FOO ============== File ================ FILE001DETAILCOUNT001 BATCH001 DETAIL001BAR </code></pre>

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