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    <p>well, the individual regexs break down into this:</p> <p>Index: Capture a single positive or negative number. (-, 0 or 1 rep, followed by one or more digits)</p> <p>date: Specified date string, separated with -. No allowance made for any other date format. Note, the leading '#' and trailing '#' are not handled, it specifically captures the date, and only the date</p> <p>R: beginning of line OR #, then the formatting replacement to make it one BIG regex...then another #, specified. then a conditional with no false...and true doesn't do anything either.</p> <p>name: capture whatever is left.</p> <p>final result, compiled into a single regex.... two captures: R and name. R: (4 parts) R-1: Match either beginning of line or # R-2: Get EITHER (but never both) Date or Index R-3: match # R-4: Empty Conditional Expression name: match whatever is left.</p> <p>The issue seems to be that you are not matching both index and date</p> <p><strong>final edit, working regex</strong></p> <p>Bear with me, this thing is nasty. You have to account for all 4 possibilities, or it wont match every possible case. I couldn't figure out any way to generalize it.</p> <pre><code>(?:(?&lt;index&gt;-?\d+(?!\d-))#(?&lt;date&gt;(?:0?[1-9]|1[012])-(?:0?[1-9]|[12]\d|:3[01])-\d{4})|(?&lt;date&gt;(?:0?[1-9]|1[012])-(?:0?[1-9]|[12]\d|:3[01])-\d{4})#(?&lt;index&gt;-?\d+)|(?!-?\d+#)(?&lt;date&gt;(?:0?[1-9]|1[012])-(?:0?[1-9]|[12]\d|:3[01])-\d{4})|(?&lt;index&gt;-?\d+)(?!#(?:0?[1-9]|1[012])-(?:0?[1-9]|[12]\d|:3[01])-\d{4}))#(?&lt;name&gt;.*) </code></pre> <p>ugly, i know. It has 4 initial conditions.</p> <pre><code>1a) capture &lt;index&gt;#&lt;date&gt; OR 1b) capture &lt;date&gt;#&lt;index&gt; OR 1c) capture &lt;index&gt; only, as long as its not followed by a date OR 1d) capture &lt;date&gt; only, as long as its not preceded by an index ... 2) match but ignore # 3) capture &lt;name&gt; </code></pre> <p>works in all 4 cases.</p> <p><strong>Final: Final Edit</strong></p> <p>There is a way to do this using 3 regexs instead of just 1, which might end up being cleaner.</p> <pre><code>//note: index MIGHT be preceeded by, and is ALWAYS followed by, a # indexRegex = @"((?=#)?(?&lt;!\d|-)-?\d+(?=#))"; //same with date dateRegex = @"((?=#)?(?:0?[1-9]|1[012])-(?:0?[1-9]|[12]\d|3[01])-\d{4}(?=#))"; //then name nameRegex = @"(?:.*#){1,2}(.*)"; </code></pre> <p>run them each separately against a replace to get the individual variables, then rebuild the string.</p>
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    1. COThat looks mostly correct but doesn't the `+` in the `INDEX_KEY_REGEX` signify that the regex will match at least one or more `\d`.
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    2. COactually....that's correct, its 1 or more. My apologies. I will edit that in.
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    3. COCurrently, that only works for a single digit index, and might mess up the date...still working on it.
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