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POCapture a part of a string that does not match another group (C# Regex)
 

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    <p>I am working on a project that requires the parsing of "formatting tags." By using a tag like this: <code>&lt;b&gt;text&lt;/b&gt;</code>, it modifies the way the text will look (that tag makes the text bold). You can have up to 4 identifiers in one tag (<code>b</code> for bold, <code>i</code> for italics, <code>u</code> for underline, and <code>s</code> for strikeout).</p> <p>For example:</p> <p><code>&lt;bi&gt;some&lt;/b&gt; text&lt;/i&gt; here</code> would produce <b><i>some</b> text</i> here.</p> <p>To parse these tags, I'm attempting to use a RegEx to capture any text before the first opening tag, and then capture any tags and their enclosed text after that. Right now, I have this:</p> <p><code>&lt;(?&lt;open&gt;[bius]{1,4})&gt;(?&lt;text&gt;.+?)&lt;/(?&lt;close&gt;[bius]{1,4})&gt;</code></p> <p>That matches a single tag, its enclosed text, and a single corresponding closing tag.</p> <p>Right now, I iterate through every single character and attempt to match the position in the string I'm at to the end of the string, e.g. I attempt to match the whole string at <code>i = 0</code>, a substring from position 1 to the end at <code>i = 1</code>, etc.</p> <p>However, this approach is incredibly inefficient. It seems like it would be better to match the entire string in one RegEx instead of manually iterating through the string.</p> <p>My actual question is is it possible to match a string that does <em>not</em> match a group, such as a tag? I've Googled this without success, but perhaps I've not been using the right words.</p>
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    1. CODoes your input have to contain only nested tags or can tags overlap? In other words, is '<b> foo <i> bar </b> baz </i>' legal input?
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      1. USMark Byers
    2. COYou say it's inefficient. Does it really affect the process? Have you profiled it?
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      1. USEsteban Küber
    3. CO@Mark You can use both <bu>text</bu> type tags and <b>text<u>moretext</u></b>.
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