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copied!<p>Inside a Regular expression, the Match Evaluator function (an anonymous method) does the grunt work and stores the newly sized lines into a StringBuilder. We don't use the return value of Regex.Replace method because we're just using its Match Evaluator function as a feature to accomplish line breaking from inside the regular expression call - just for the heck of it, because I think it's cool.</p> <pre><code>using System; using System.Text; using System.Text.RegularExpressions; </code></pre> <p><strong>strInput</strong> is what you want to convert the lines of. </p> <pre><code>int MAX_LEN = 60; StringBuilder sb = new StringBuilder(); int bmark = 0; //bookmark position Regex.Replace(strInput, @".*?\b\w+\b.*?", delegate(Match m) { if (m.Index - bmark + m.Length + m.NextMatch().Length > MAX_LEN || m.Index == bmark && m.Length >= MAX_LEN) { sb.Append(strInput.Substring(bmark, m.Index - bmark + m.Length).Trim() + Environment.NewLine); bmark = m.Index + m.Length; } return null; }, RegexOptions.Singleline); if (bmark != strInput.Length) // last portion sb.Append(strInput.Substring(bmark)); string strModified = sb.ToString(); // get the real string from builder </code></pre> <p>It's also worth noting the second condition in the if expression in the Match Evaluator <code>m.Index == bmark && m.Length >= MAX_LEN</code> is meant as an exceptional condition in case there is a word longer than 60 chars (or longer than the set max length) - it will not be broken down here but just stored on one line by itself - I guess you might want to create a second formula for that condition in the real world to hyphenate it or something.</p>

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