将.htaccess内容与PHP中的正则表达式进行匹配

Question

I'm trying to regex match the couple of things from the content of .htaccess file.

Basically everything in between the comments ##bbc-startSOME_IP_HERE_AND_SOME_LABEL and ##bbc-end

The idea is to grab the rule between comments and replace it with empty string, if exists:

<IfModule mod_rewrite.c>
RewriteEngine On
##bbc-start-1Mail.RU_Bot
RewriteCond %{REMOTE_HOST} -1 [OR]
RewriteCond %{HTTP_USER_AGENT} Mail.RU_Bot 
RewriteRule . - [F]
##bbc-end
##bbc-start66.249.78.150googlebot
RewriteCond %{REMOTE_HOST} 66.249.78.150 [OR]
RewriteCond %{HTTP_USER_AGENT} googlebot 
RewriteRule . - [F]
##bbc-end
##bbc-start157.55.33.50bingbot
RewriteCond %{REMOTE_HOST} 157.55.33.50 [OR]
RewriteCond %{HTTP_USER_AGENT} bingbot 
RewriteRule . - [F]
##bbc-end
</IfModule>

Used pattern is:

$regex_pattern = "/##bbc-start{$bot_banned_ip}{$bot_banned_mark}(.*?)##bbc-end/m"; 

...where {$bot_banned_ip} and {$bot_banned_mark} are provided in runtime.

The above pattern was tested and works just fine on-line on http://www.rubular.com/r/bfoeQnah49

and on http://www.regexe.com/, but surprisingly fail to work in PHP environment, 5.3.18 with preg_match() or preg_replace().

Do I miss something, is it the problem with my environment?

EDIT: The exact code is:

$file_contents = '<IfModule mod_rewrite.c>
    RewriteEngine On
    ##bbc-start-1Mail.RU_Bot
    RewriteCond %{REMOTE_HOST} -1 [OR]
    RewriteCond %{HTTP_USER_AGENT} Mail.RU_Bot 
    RewriteRule . - [F]
    ##bbc-end
    ##bbc-start66.249.78.150googlebot
    RewriteCond %{REMOTE_HOST} 66.249.78.150 [OR]
    RewriteCond %{HTTP_USER_AGENT} googlebot 
    RewriteRule . - [F]
    ##bbc-end
    ##bbc-start157.55.33.50bingbot
    RewriteCond %{REMOTE_HOST} 157.55.33.50 [OR]
    RewriteCond %{HTTP_USER_AGENT} bingbot 
    RewriteRule . - [F]
    ##bbc-end
    </IfModule>';
$regex_pattern = "/##bbc-start{$bot_banned_ip}{$bot_banned_mark}(.*?)##bbc-end/m";
$match = preg_match($regex_pattern, $file_contents);
//preg_match() returns 1 if the pattern matches given subject, 0 if it does not, or FALSE if an error occurred.    
if ($match===1) { /*DO SOME STUFF*/}

The strange thing is that $match is always 0.

Answer 1

I believe you need s switch for DOTALL and preg_quote function to escape your variables for possible regex symbols.

Try this regex:

$regex_pattern = "/##bbc-start" . preg_quote($bot_banned_ip, '/') . 
                 preg_quote($bot_banned_mark, '/') . "(.*?)##bbc-end/is";

Also do check your regex by doing:

var_dump ( $regex_pattern );