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POWord Wrapping with Regular Expressions
 

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    <p>EDIT FOR CLARITY - I know there are ways to do this in multiple steps, or using LINQ or vanilla C# string manipulation. The reason I am using a single regex call, is because I wanted practice with complex regex patterns. - END EDIT</p> <p>I am trying to write a single regular expression that will perform word wrapping. It's extremely close to the desired output, but I can't quite get it to work.</p> <pre><code>Regex.Replace(text, @"(?&lt;=^|\G)(.{1,20}(\s|$))", "$1\r\n", RegexOptions.Multiline) </code></pre> <p>This is correctly wrapping words for lines that are too long, but it's adding a line break when there already is one.</p> <p>Input</p> <pre><code>"This string is really long. There are a lot of words in it.\r\nHere's another line in the string that's also very long." </code></pre> <p>Expected Output</p> <pre><code>"This string is \r\nreally long. There \r\nare a lot of words \r\nin it.\r\nHere's another line \r\nin the string that's \r\nalso very long." </code></pre> <p>Actual Output</p> <pre><code>"This string is \r\nreally long. There \r\nare a lot of words \r\nin it.\r\n\r\nHere's another line \r\nin the string that's \r\nalso very long.\r\n" </code></pre> <p>Note the double "\r\n" between sentences where the input already had a line break and the extra "\r\n" that was put at the end.</p> <p>Perhaps there's a way to conditionally apply different replacement patterns? I.E. If the match ends in "\r\n", use replace pattern "$1", otherwise, use replace pattern "$1\r\n".</p> <p>Here's a link to a similar question for wrapping a string with no white space that I used as a starting point. <a href="https://stackoverflow.com/questions/4749265/regular-expression-to-find-unbroken-text-and-insert-space">Regular expression to find unbroken text and insert space</a></p>
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    1. USJustin Ryder
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    1. COso does your string really have the `\r\n` or those characters?
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      1. USDaniel A. White
    2. CObtw +1 for a clever way to wordwrap!
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    3. CO\r\n is the carriage return, then the new line escape characters. I'm testing this with a hard coded string, but the data this will run against is coming from a database and follows the same convention for line breaks.
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