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copied!<p>If you know that your regex will always have two capturing groups, then you can regex the regex, so to speak.</p> <pre><code>private Regex captures = new Regex(@"\(.+?\)"); public string ConstructFolderName(string firstGroup, string secondGroup, string pattern) { MatchCollection matches = captures.Matches(pattern); return pattern.Replace(matches[0].Value, firstGroup).Replace(matches[1].Value, secondGroup); } </code></pre> <p>Obviously this doesn't have any error checking and might be better done with some other method than String.Replace; but, this certainly works and should give you some ideas.</p> <p><strong>EDIT</strong>: An obvious improvement would be to actually use the pattern to validate the <code>firstGroup</code> and <code>secondGroup</code> strings before you construct them. The <code>MatchCollection</code>'s 0 and 1 item could create their own Regex and perform a match there. I can add that if you want.</p> <p><strong>EDIT2</strong>: Here's the validation I was talking about:</p> <pre><code>private Regex captures = new Regex(@"\(.+?\)"); public string ConstructFolderName(string firstGroup, string secondGroup, string pattern) { MatchCollection matches = captures.Matches(pattern); Regex firstCapture = new Regex(matches[0].Value); if (!firstCapture.IsMatch(firstGroup)) throw new FormatException("firstGroup"); Regex secondCapture = new Regex(matches[1].Value); if (!secondCapture.IsMatch(secondGroup)) throw new FormatException("secondGroup"); return pattern.Replace(firstCapture.ToString(), firstGroup).Replace(secondCapture.ToString(), secondGroup); } </code></pre> <p>Also, I might add that you can change the second capturing group to <code>([0-9ABa-c]+)</code> since A to B isn't really a range.</p>

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