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    <p>This was quick-tested in Perl.</p> <p><strong>Edit</strong> - This regex code simulates the word wrap used (good or bad) in MS-Windows <em>Notepad.exe</em> </p> <pre><code> # MS-Windows "Notepad.exe Word Wrap" simulation # ( N = 16 ) # ============================ # Find: @"(?:((?&gt;.{1,16}(?:(?&lt;=[^\S\r\n])[^\S\r\n]?|(?=\r?\n)|$|[^\S\r\n]))|.{1,16})(?:\r?\n)?|(?:\r?\n|$))" # Replace: @"$1\r\n" # Flags: Global # Note - Through trial and error discovery, it apparears Notepad accepts an extra whitespace # (possibly in the N+1 position) to help alignment. This matters not because thier viewport hides it. # There is no trimming of any whitespace, so the wrapped buffer could be reconstituted by inserting/detecting a # wrap point code which is different than a linebreak. # This regex works on un-wrapped source, but could probably be adjusted to produce/work on wrapped buffer text. # To reconstitute the source all that is needed is to remove the wrap code which is probably just an extra "\r". (?: # -- Words/Characters ( # (1 start) (?&gt; # Atomic Group - Match words with valid breaks .{1,16} # 1-N characters # Followed by one of 4 prioritized, non-linebreak whitespace (?: # break types: (?&lt;= [^\S\r\n] ) # 1. - Behind a non-linebreak whitespace [^\S\r\n]? # ( optionally accept an extra non-linebreak whitespace ) | (?= \r? \n ) # 2. - Ahead a linebreak | $ # 3. - EOS | [^\S\r\n] # 4. - Accept an extra non-linebreak whitespace ) ) # End atomic group | .{1,16} # No valid word breaks, just break on the N'th character ) # (1 end) (?: \r? \n )? # Optional linebreak after Words/Characters | # -- Or, Linebreak (?: \r? \n | $ ) # Stand alone linebreak or at EOS ) </code></pre> <p><strong>Test Case</strong> The wrap width N is 16. Output matches Notepad's and over a variety of widths. </p> <pre><code> $/ = undef; $string1 = &lt;DATA&gt;; $string1 =~ s/(?:((?&gt;.{1,16}(?:(?&lt;=[^\S\r\n])[^\S\r\n]?|(?=\r?\n)|$|[^\S\r\n]))|.{1,16})(?:\r?\n)?|(?:\r?\n|$))/$1\r\n/g; print $string1; __DATA__ hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh bbbbbbbbbbbbbbbbEDIT 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 pppppppppppppppppppUf </code></pre> <p>Output >></p> <pre><code> hhhhhhhhhhhhhhhh hhhhhhhhhhhhhhh bbbbbbbbbbbbbbbb 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 pppppppppppppppp pppUf </code></pre>
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    1. POWord Wrapping with Regular Expressions
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    1. COAt last, word wrap.
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    2. COWhen I first tried word wrapping with regex, I didn't think it was possible. This has definitely convinced me of the power of regex patterns.
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    3. COLook at this one for process arguments. [Args](http://stackoverflow.com/questions/20303036/regular-expression-to-match-process-arguments/20303808#20303808). I highly recommend the http://RegexFormat.com application to process Regular Expressions.
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