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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.

share|improve this question
Why don't you remove all comments ? – meotimdihia Nov 24 '11 at 6:47

2 Answers

up vote 1 down vote accepted

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?

share|improve this answer
/\n\s*\/*.*?*\/\s*\n/s – Godwin Nov 24 '11 at 7:04
actually: /(^|\n)\s*\/*.*?*\/\s*(\n|$)/s – Godwin Nov 24 '11 at 7:08
/\n\s*\/*.*?*\/\s*\n/s and /(^|\n)\s*\/*.*?*\/\s*(\n|$)/s not working for me , @Godwin. Produce some error when using preg_replace. – Zulkhaery Basrul Nov 24 '11 at 7:20
What's the error? I'm not getting one. – Godwin Nov 24 '11 at 7:23
Sorry about that, I think there was something off when I cut and pasted. Check the edit in the original answer. – Godwin Nov 24 '11 at 7:27
up vote 0 down vote

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;
share|improve this answer
Thanks, its work in one line comment, how about multi line comment. like: /****** Line1 line2 line3 ******/ – Zulkhaery Basrul Nov 24 '11 at 7:23
Multi-Lane support added example link: codepad.org/Tknf440o – Utku Yıldırım Nov 24 '11 at 7:32
ok, thanks. Its work . – Zulkhaery Basrul Nov 24 '11 at 7:34
i will add explanation later – Utku Yıldırım Nov 24 '11 at 7:36
Updated for smaller regex – Utku Yıldırım Nov 24 '11 at 7:45

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