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    <p>I think there is an escape out of the code mode with any trailing newline not followed by tab or 4 spaces. Not sure but successive newlines would not be included in the code block.</p> <p>I don't get Ruby's regex options too well, but this seems to work: <a href="http://rubular.com/r/BlbreoO3sn" rel="nofollow">http://rubular.com/r/BlbreoO3sn</a></p> <p><code>((?:^(?:[ ]{4}|\t).*$(?:\r?\n|\z))+)</code> Theorhetically, its in multi-line mode. </p> <p>Just make the replacement <code>&lt;pre&gt;\1&lt;/pre&gt;</code></p> <p><strong>EDIT</strong><br> @Rachela Meadows - After further examination, this is a fairly difficult regex.<br> I managed to exactly duplicate the functionality of the <code>&lt;pre&gt;&lt;code&gt;</code> block features of the online editor here on SO.</p> <p>After obtaining each block and before wrapping in a <code>&lt;pre&gt;&lt;code&gt;</code>, all markup entities should be converted (ie; like <code>&lt;</code> to <code>&amp;lt;</code>, etc). That being said, I didn't do that step in the Ruby code sample below. I do have the regex's to do that though.</p> <p>A special note about trimming: The main regex below does not include residual trailing newlines. Nor does the SO functionality. So the code block is correct top to bottom.<br> However, the leading 4 spaces (or tab) that <em>could</em> be contained in the body can't be trimmed (and they should be) in the main regex. For that it needs a callback.</p> <p>Playing around with the <code>gsub</code> <em>block</em> mode, its easy to trim those leading spaces/tab.</p> <p>Let me know if you have any problems with this.</p> <p>Links -<br> Rubular (for the regex): <a href="http://rubular.com/r/pp9oRLQ0xo" rel="nofollow">http://rubular.com/r/pp9oRLQ0xo</a><br> Ideone (for the working Ruby code): <a href="http://ideone.com/aA9it" rel="nofollow">http://ideone.com/aA9it</a></p> <p>Regex compressed -<br> <code>(^\s*$\n|\A)(^(?:[ ]{4}|\t).*[^\s].*$\n?(?:(?:^\s*$\n?)*^(?:[ ]{4}|\t).*[^\s].*$\n?)*)</code> </p> <p>Regex expanded - </p> <pre><code>(^\s*$\n|\A) # Capt grp 1, block is preceeded by a blank line or begin of string ( # Begin "Capture group 2", start of pre/code block ^(?:[ ]{4}|\t) .* [^\s] .* $ \n? # First line of code block (note - lines must contain at least 1 non-whitespace character) (?: # Start "Optionally, get more lines of code" (?: ^ \s* $ \n? )* # Many optional blank lines ^(?:[ ]{4}|\t) .* [^\s] .* $ \n? # Another line of code )* # End "Optionally, get more lines of code", do 0 or more times ) # End "Capture group 2", end of pre/code block </code></pre> <p>Ruby code - </p> <pre><code> regex = /(^\s*$\n|\A)(^(?:[ ]{4}|\t).*[^\s].*$\n?(?:(?:^\s*$\n?)*^(?:[ ]{4}|\t).*[^\s].*$\n?)*)/; data = ' Hello Worldsasdasdffasdfasdf asdf thisdqweee asdfasdfasdfasdf sdfg #YYYY { height: 100%; min-height: 800px; margin-right: 20px; position: relative; } #ZZZZZZ { height: 100%; overflow: hidden; }'; # --- result = data.gsub(regex) { || x=$2; ## Construct the return value '\1&lt;pre&gt&lt;code&gt\2&lt;/code&gt&lt;/pre&gt'. ## But, trim each line with 1 to 4 leading spaces (or a tab with regex on the bottom). ## They are not necessary now, they are replaced with a code block. $1 + '&lt;pre&gt&lt;code&gt' + x.gsub(/^[ ]{1,4}/, '') + '&lt;/code&gt&lt;/pre&gt' }; # Note - Tabs can be trimed too, use : x.gsub(/^(?:[ ]{1,4}|\t)/,'') in the above print result; </code></pre>
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    1. COThanks, how do you do the replacements?
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    2. COThis is removing everything that's not code which isn't good. I'd like to keep the original text just wrap code in the <pre> tag?
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    3. CO@Rachela Meadows - Added revised regex and a Ruby code sample.
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