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PORecursive RegEx to match keys and name
 

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    <p>I have the strings, <code>["02-03-2013#3rd Party Fuel", "-1#Archived", "2#06-23-2013#Newswire"]</code>, which I want to break down into several parts. These strings are prefixed with date and index keys and contain a name.</p> <p>I've design a <code>RegEx</code> that matches each key properly. However, if I want to match the index key, date key, and name in fell swoop. Only the first key is found. It seems the recursive group isn't working as I expect it should.</p> <pre><code>private const string INDEX_KEY_REGEX = @"(?&lt;index&gt;-?\d+)"; private const string DATE_KEY_REGEX = @"(?&lt;date&gt;(?:0?[1-9]|1[012])-(?:0?[1-9]|[12]\d|3[01])-\d{4})"; private const string KEY_SEARCH_REGEX = @"(?&lt;R&gt;(?:^|(?&lt;=#))({0})#(?(R)))(?&lt;name&gt;.*)"; private string Name = "2#06-23-2013#Newswire" ... = Regex.Replace( Name, String.Format(KEY_SEARCH_REGEX, INDEX_KEY_REGEX + "|" + DATE_KEY_REGEX), "${index}, ${date}, ${name}" ); // These are the current results for all strings when set into the Name variable. // Correct Result: ", 02-03-2013, 3rd Party Fuel" // Correct Result: "-1, , Archived" // Invalid Result: "2, , 06-23-2013#Newswire" // Should be: "2, 06-23-2013, Newswire" </code></pre> <p>Does a keen eye see something I've missed?</p> <hr> <p><strong>Final Solution As I Needed It</strong></p> <p>It turns out I didn't need a recursive group. I simply needed 0 to many sequence. Here is the full <code>RegEx</code>.</p> <pre><code>(?:(?:^|(?&lt;=#))(?:(?&lt;index&gt;-?\d+)|(?&lt;date&gt;(?:0?[1-9]|1[012])-(?:0?[1-9]|[12]\d|3[01])-(\d{2}|\d{4})))#)*(?&lt;name&gt;.*) </code></pre> <p>And, the segmented <code>RegEx</code></p> <pre><code>private const string INDEX_REGEX = @"(?&lt;index&gt;-?\d+)"; private const string DATE_REGEX = @"(?&lt;date&gt;(?:0?[1-9]|1[012])-(?:0?[1-9]|[12]\d|3[01])-(\d{2}|\d{4}))"; private const string KEY_WRAPPER_REGEX = @"(?:^|(?&lt;=#))(?:{0})#"; private const string KEY_SEARCH_REGEX = @"(?:{0})*(?&lt;name&gt;.*)"; </code></pre>
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    1. COIt works for this test case if you remove the `^|` test. What's the intent of that?
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    2. COThat was to ensure the keys are always at the beginning and never at the end or having an undermined string before them. I'll test without it but I think it will break the stated requirement. I'll see what I find.
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    3. COSo with my testing the following results `2#, 06-23-2013, Newswire` and `-1#Archived` (no matches). So that's farther from the desired.
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