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    <p>You can try this.<br> Some questions. Are you accumulating and processing more than 1 line at a time? </p> <p>If not, I don't see any provisions for block comments that extend over multiple lines.<br> Also, block comments consume line comments, and I don't see any provisions for line comment continuation.</p> <p><strong>Edit - 5</strong> @Adrian - I punched up a version that works for me. The Perl code and output are below.<br> Let me know if this does the trick.<br> Note that a added line continuation code for <code>#</code>Preprocessor as well as <code>//</code>Line comments<br> and it tests out very nice. </p> <pre><code> my $doubleQuotedString = q{"(?&gt;[^"\\\\]++|\\\\{2}|\\\\(?s).)*+"}; my $singleQuotedString = q{'(?&gt;[^'\\\\]++|\\\\{2}|\\\\(?s).)*+'}; my ($rest, $code, $stuffToIgnore) = (""); my $counter = 0; while (&lt;DATA&gt;) { $_ = "$rest$_"; do { ($code, $stuffToIgnore, $rest) = m~ ( # (1), Code (?: (?! ^ [^\S\n]* \# ) # Not a preprocessor statement (?: $ doubleQuotedString # found a string | $ singleQuotedString # found a string | (?: [^/\n]++ | / [^*/\n] ) # found something not a string or comment or newline | \n # newline ) )*+ ) ( # (2), Ignore (?: \s*+ ^ [^\S\n]* \# # '#' Preprocessor statement with Continuation logic (?: [^\\] # any Non-Continuation character ^\ | \\ \n? # Or, any Continuation character followed by optional newline )*? (?&lt;! \\ ) \n | \s*+ /\* # '/**_**/' Block comment (?: [^*]++ | \* (?! / ) )*+ \*/ | \s*+ // # '//' Line comment, with Continuation logic (?: [^\\] | \\ \n? )*? (?&lt;! \\ ) \n )*+ ) ( # (3), Rest (?s) .* ) ~xm; ++$counter; goto BLOCK_READ if $stuffToIgnore ne "" or eof(DATA); } while ($_ .= &lt;DATA&gt;); BLOCK_READ: defined $code or die "Unterminated block."; # do transformation on $code print "CODE: &gt;&gt;$code&lt;&lt;\nIGNORE: &gt;&gt;$stuffToIgnore&lt;&lt;\n---------------------------------------\n"; } __DATA__ # hello \ there # how # are #you #pragma once #include "EditState.h" #include "MyDoc.h" // InputEdit class CInputEdit : public CEdit { DECLARE_DYNAMIC(CInputEdit) public: CInputEdit(); virtual ~CInputEdit(); // Attributes protected: DECLARE_MESSAGE_MAP() BOOL m_bTrackingMenu; }; </code></pre> <p>Output </p> <pre><code> CODE: &gt;&gt; &lt;&lt; IGNORE: &gt;&gt;# hello \ there &lt;&lt; --------------------------------------- CODE: &gt;&gt;&lt;&lt; IGNORE: &gt;&gt;# how &lt;&lt; --------------------------------------- CODE: &gt;&gt;&lt;&lt; IGNORE: &gt;&gt;# are &lt;&lt; --------------------------------------- CODE: &gt;&gt;&lt;&lt; IGNORE: &gt;&gt;#you &lt;&lt; --------------------------------------- CODE: &gt;&gt; &lt;&lt; IGNORE: &gt;&gt;#pragma once &lt;&lt; --------------------------------------- CODE: &gt;&gt; &lt;&lt; IGNORE: &gt;&gt;#include "EditState.h" &lt;&lt; --------------------------------------- CODE: &gt;&gt;&lt;&lt; IGNORE: &gt;&gt;#include "MyDoc.h" &lt;&lt; --------------------------------------- CODE: &gt;&gt; &lt;&lt; IGNORE: &gt;&gt;// InputEdit &lt;&lt; --------------------------------------- CODE: &gt;&gt; class CInputEdit : public CEdit { DECLARE_DYNAMIC(CInputEdit) public: CInputEdit(); virtual ~CInputEdit(); &lt;&lt; IGNORE: &gt;&gt;// Attributes &lt;&lt; --------------------------------------- CODE: &gt;&gt;protected: DECLARE_MESSAGE_MAP() BOOL m_bTrackingMenu; }; &lt;&lt; IGNORE: &gt;&gt;&lt;&lt; --------------------------------------- </code></pre>
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    1. POhow to separate stuff I want from what I don't in perl?
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    1. COYes, I'm accumulating more than one line of code to transform at a time. That's what the `do/while` loop is for. As for multiline block comments, they are provided for via the `# block comment` section. This would also consume any line comments embedded in the block comment. You're right about the line comment continuation. Also applies to preprocessor continuation too.
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    2. CO**Edit2:** this will not work. the `# found something not ...` will capture a preprocessor statement and that's the main problem. **Edit:** Thanks for your help, but that is not really that concerning, I have that under control.
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    3. COFYI, `[^\\]` matches `\r` and `\n`.
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