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copied!<p>Basically you want to look for all sequences of digits optionally ending with a decimal point and another digit sequence and then append a 'c'. Here's an example, assuming you're using Perl (your question doesn't say):</p> <pre><code>$_ = 'treand60(12.3)/1010 + 1 >1010'; s/\b\d+(?:\.\d+)?/$&c/g; print; # output is "treand60(12.3c)/1010c + 1c >1010c" </code></pre> <p><code>\d+</code> is 1 or more digit and then <code>\.\d+</code> is 1 or more digit after a decimal point. The <code>(?: ... )</code> is a <a href="http://perl.active-venture.com/pod/perlretut-noncapturing.html" rel="nofollow noreferrer">non-capturing group</a>. The last <code>?</code> means "match zero or one of these" (i.e. it's optional). And the <code>\b</code> means match only on word boundaries (this prevents something like "Hello123" from matching because the number comes directly after a word character).</p> <p>Here is the C# equivalent:</p> <pre><code>using System.Text.RegularExpressions; // ... string input = "treand60(12.3)/1010 + 1 >1010"; Regex regex = new Regex(@"\b\d+(?:\.\d+)?"); string output = regex.Replace(input, (m) => m.Value + 'c'); Console.WriteLine(output); // prints "treand60(12.3c)/1010c + 1c >1010c" </code></pre> <p>The lambda expression inside the <a href="http://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex.replace.aspx" rel="nofollow noreferrer">Regex.Replace</a> call is a <a href="http://msdn.microsoft.com/en-us/library/system.text.regularexpressions.matchevaluator.aspx" rel="nofollow noreferrer">MatchEvaluator</a> which simply gets the match text and appends a 'c'.</p>

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