[PHP] Re: Regex for balanced brackets?

[Al]

Jeffrey Sambells wrote:

I came across this method of matching brackets with regex in .NET

http://puzzleware.net/blogs/archive/2005/08/13/22.aspx

but I am wondering if it is possible to do the same in PHP?

I've tried it a bit but I can't seem to get it to work properly. I'm just wondering if I am doing something wrong or if it is just not possible.

Thanks.

here is the code I was playing with:

<?php

$pattern = <<<PATTERN
\{
    (?>
        [^{}]+
        |
        \{ (?P<DEPTH>)
        |
        \} (?P<-DEPTH>)
    )*
    (?(DEPTH)(?!))

\}
PATTERN;

$subject = <<<SUBJECT
test {
    test2 {
        test3
    }
}

test4
{

}
SUBJECT;


preg_match_all("/$pattern/ix",$subject,$matches);

header("content-type: text/plain; ");

var_dump($matches);

?>


- Jeff



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Jeffrey Sambells
Director of Research and Development
Zend Certified Engineer (ZCE)

We-Create Inc.
[EMAIL PROTECTED] email
519.745.7374 office
519.897.2552 mobile

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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If I'm understanding what you want, consider this.  I use it to check matching 
tags.

First get an array of all the start tags:

$pattern= "%<([^/][a-z_\-]*)>%i";               //all start tags used <xxx>

preg_match_all("$pattern", $text_str, $matches);

$start_tags= $matches[1];

$start_tag_nums= array_count_values($start_tags);       //get count for each tag

Then do the same for your end tags, using the same pattern but with the end tag 
slash. </....

Finally, you make a text list of the mismatches:

foreach($start_tag_nums as $tag=> $num){
                
        if($num != $end_tag_nums[$tag]) $end_error_msg .= "&lt;$tag&gt; || ";
        
}//end foreach
        
echo $end_error_msg;

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