How can I remove comments from CSS using Regex.Replace()?
Note - I'm not able to use the regex mentioned here in C# - Regular expression to remove CSS comments.
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4Why are you not able to use it?Daniel Hilgarth– Daniel Hilgarth2011-03-11 11:18:29 +00:00Commented Mar 11, 2011 at 11:18
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I suspect it's because PHP uses Perl-regexes.Anonymous Coward– Anonymous Coward2011-03-11 11:25:57 +00:00Commented Mar 11, 2011 at 11:25
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Now that's an exemplary attitude, providing the link for duplicate closing by your own. Oh, by the way, your question should be a comment on the answer at that question.Bobby– Bobby2011-03-11 11:26:18 +00:00Commented Mar 11, 2011 at 11:26
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possible duplicate of Regular expression to remove CSS commentsBobby– Bobby2011-03-11 11:26:41 +00:00Commented Mar 11, 2011 at 11:26
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@Daniel I dont understand regular expressions quite well and the regex given in that link was having some escape characters issue in C#.NLV– NLV2011-03-11 13:30:19 +00:00Commented Mar 11, 2011 at 13:30
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4 Answers
That would be normally enough (assuming cssLines is a string containing all lines of your CSS file):
Regex.Replace(cssLines, @"/\*.+?\*/", string.Empty, RegexOptions.Singleline)
Please note that the Singleline option will allow to match multi-line comments.
Comments
Use the regex from the linked question like so:
var rx = new Regex(@"(?<!"")\/\*.+?\*\/(?!"")");
Comments
I wonder if the following version of Maxim's solution would be faster.
"/\*[^*]*.*?\*/"
As the discussion shows this will also eliminate comments within string literals.
4 Comments
Maxim Gueivandov
it would not match if the comment itself contains the
* character.
Daniel Hilgarth
But it also doesn't work correctly ;-) It will detect comments inside strings. See the linked question for an example.
Maxim Gueivandov
@Daniel: given that requirement, the proposed regexp in the linked comment will also wrongly match
" before /* not a comment */ after". It's probably getting too complicated to handle all possible cases with regexps alone.Daniel Hilgarth
@Maxim: Indeed, you are right. I only checked the sample provided in the original question...
Very late reply but thought it will be useful for some
"(?:/*(.|[\r\n])?/)|(?:(?([^)])//.)"
This will help removing css comments both singleline and multiline.
