PHP Regex删除特定的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.

Answer 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:

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

Do you understand what it's doing?