RegEx剥离HTML注释

Looking for a regexp sequence of matches and replaces (preferably PHP but doesn't matter) to change this (the start and end is just random text that needs to be preserved).

IN:

fkdshfks khh fdsfsk 
<!--g1-->
<div class='codetop'>CODE: AutoIt</div>
<div class='geshimain'>
    <!--eg1-->
    <div class="autoit" style="font-family:monospace;">
        <span class="kw3">msgbox</span>
    </div>
    <!--gc2-->
    <!--bXNnYm94-->
    <!--egc2-->
    <!--g2-->
</div>
<!--eg2-->
fdsfdskh

to this OUT:

fkdshfks khh fdsfsk 
<div class='codetop'>CODE: AutoIt</div>
<div class='geshimain'>
    <div class="autoit" style="font-family:monospace;">
        <span class="kw3">msgbox</span>
    </div>
</div>
fdsfdskh

Thanks.

Are you just trying to remove the comments? How about

s/<!--[^>]*-->//g

or the slightly better (suggested by the questioner himself):

<!--(.*?)-->

But remember, HTML is not regular, so using regular expressions to parse it will lead you into a world of hurt when somebody throws bizarre edge cases at it.

Ah I've done it,

<!--(.*?)-->

preg_replace('/<!--(.*)-->/Uis', '', $html)

This PHP code will remove all html comment tags from the $html string.

Try the following if your comments contain line breaks:

/<!--(.|
)*?-->/g

Do not forget to consider conditional comments, as

<!--(.*?)-->

will remove them. Try this instead:

<!--[^\[](.*?)-->

This will also remove downlevel-revealed conditional comments, though.

EDIT:

This won't remove downlevel-revealed or downlevel-hidden comments.

<!--(?!<!)[^\[>].*?-->

these code is also remove javascript code. that's too bad :|

here's the example javascript code will be remove with this code:

<script type="text/javascript"><!--
    var xxx = 'a';
    //-->
    </script>

<!--([\s\S]*?)-->

Works in javascript and VBScript also as "." doesn't match line breaks in all languages

function remove_html_comments($html) {
   $expr = '/<!--[\s\S]*?-->/';
   $func = 'rhc';
   $html = preg_replace_callback($expr, $func, $html);
   return $html;
}

function rhc($search) {
   list($l) = $search;
   if (mb_eregi("\[if",$l) || mb_eregi("\[endif",$l) )  {
      return $l;
   }
}

A better version would be:

(?=<!--)([\s\S]*?)-->

It matches html comments like these:

<!--
multi line html comment
-->

or

<!-- single line html comment -->

and what is most important it matches comments like this (the other regex shown by others do not cover this situation):

<!-- this is my blog: <mynixworld.inf> -->

Note

Although syntactically the one below is a html comment your browser might parse it somehow differently and thus it might have a special meaning. Stripping such strings might break your code.

<!--[if !(IE 8) ]><!-->

Here is my attempt:

<!--(?!<!)[^\[>][\s\S]*?-->

This will also remove multi line comments and won't remove downlevel-revealed or downlevel-hidden comments.

// Remove multiline comment
    $mlcomment = '/\/\*(?!-)[\x00-\xff]*?\*\//';
    $code = preg_replace ($mlcomment, "", $code);
// Remove single line comment
    $slcomment = '/[^:]\/\/.*/';
    $code = preg_replace ($slcomment, "", $code);
// Remove extra spaces
    $extra_space = '/\s+/';
    $code = preg_replace ($extra_space, " ", $code);
// Remove spaces that can be removed
    $removable_space = '/\s?([\{\};\=\(\)\\\/\+\*-])\s?/';
    $code = preg_replace ('/\s?([\{\};\=\(\)\/\+\*-])\s?/', "\\1", $code);