PHP Regex to remove specific CSS Comment

Question

I want to write the regular expression in php matching condition below:

   /* 
    Remove this comment line 1
    Remove this comment line 2
   */
   .class1
   {
      background:#CCC url(images/bg.png);
   }

   .class2
   {
      color: #FFF;
      background:#666 url(images/bg.png); /* DON'T remove this comment */
   }

   /* Remove this comment */
   .class3
   {
      margin:2px;
      color:#999;
      background:#FFF; /* DON'T Remove this comment */
   }

    ...etc
    ...etc

Please any one give me a regular expression in php. Thanks.

Why don't you remove all comments ?

meotimdihia
– meotimdihia

2011-11-24 06:47:26 +00:00
Commented Nov 24, 2011 at 6:47 — meotimdihia
– meotimdihia, Commented Nov 24, 2011 at 6:47

Godwin · Accepted Answer · 2011-11-24 07:26:31Z

1

If the rule is that you want to remove all comments where there is no other code on the line then something like this should work:

/^(\s*\/\*.*?\*\/\s*)$/m

The 'm' option makes ^ and $ match the beginning and end of a line. Do you expect the comments to run for more than one line?

EDIT:

I'm pretty sure this fits the bill:

/(^|\n)\s*\/\*.*?\*\/\s*/s

Do you understand what it's doing?

edited Nov 24, 2011 at 7:26

answered Nov 24, 2011 at 6:52

Godwin

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3 Comments

Godwin Over a year ago

actually: /(^|\n)\s*\/*.*?*\/\s*(\n|$)/s

Zul Over a year ago

/\n\s*\/*.*?*\/\s*\n/s and /(^|\n)\s*\/*.*?*\/\s*(\n|$)/s not working for me , @Godwin. Produce some error when using preg_replace.

Godwin Over a year ago

Sorry about that, I think there was something off when I cut and pasted. Check the edit in the original answer.

klaudius · Accepted Answer · 2013-07-29 21:38:23Z

1

Not working for multiline comments like

/*
 * Lorem ipsum
 */

This one do the job

$regex = "!/\*[^*]*\*+([^/][^*]*\*+)*/!";
$newstr = preg_replace($regex,"",$str);
echo $newstr;

http://codepad.org/xRb2Gdhy

Found here : http://www.catswhocode.com/blog/3-ways-to-compress-css-files-using-php

answered Jul 29, 2013 at 21:38

klaudius

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Comments

Utku Yıldırım · Accepted Answer · 2011-11-24 07:45:42Z

0

Codepad: http://codepad.org/aMvQuJSZ

Support multiline:

/* Remove this comment 
multi-lane style 1*/

/* Remove this comment 
multi-lane style 2
*/

/* Remove this comment */

Regex Explanation:

^            Start of line
\s*          only contains whitespace
\/\*         continue with /*
[^(\*\/)]*   unlimited number of character except */ includes newline
\*\/         continue with */
m            pattern modifier (makes ^ start of line, $ end of line

Example php code:

$regex = "/^\s*\/\*[^(\*\/)]*\*\//m";
$newstr = preg_replace($regex,"",$str);
echo $newstr;

edited Nov 24, 2011 at 7:45

answered Nov 24, 2011 at 7:13

Utku Yıldırım

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1 Comment

Zul Over a year ago

Thanks, its work in one line comment, how about multi line comment. like: /****** Line1 line2 line3 ******/

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