PHP - BBCode parser - recursive [quote] with regex and preg_replace

Question

i'm making my own bbcode parser, and i've a problem when i try to do the recursive quote.

this is my code :

 function forumBBCode($str){
$format_search=array(
'#\[quote=(.*?)\](.*?)\[/quote\]#is'
);

$format_replace=array(
'<blockquote class="quotearea"><i><a class="lblackbu" href="./index.php?status=userview&userv=$1">$1</a> wrote :</i><br />$2</blockquote>'
);

$str=preg_replace($format_search, $format_replace, $str);
$str=nl2br($str);
return $str;
}

what i must add/edit to do a recursive quote? in other words, when a quote is inside another quote...

cheers and tnx for the help

That's pretty difficult if you're new to regular expressions. Recursive regexes are tricky, so most people opt for the /e evaluation flag and actually have the regex "parser" descent into enclosed content. Anyway, first read through regular-expressions.info - it's a better introduction than the PHP manual. — mario
– mario, Commented Jul 9, 2010 at 22:49
i'll learn this guide and i'll try to make a function :) i'll let you know, i hope you can help me anyway! tnx!!! — markzzz
– markzzz, Commented Jul 9, 2010 at 23:58
I think you have two possible ways to solve that: a) loop through the content and search for opening and closing quote tags and replace them if both were found (leave the rest as visible bbcode) or b) use preg_replace_callback() that calls itself again if a nested quote tags was found. — mgutt
– mgutt, Commented Mar 30, 2017 at 19:38

TylerT · Accepted Answer · 2011-02-12 05:53:00Z

4

This is an old Q but I'll post my solution anyway for ppl =]

$open = '<blockquote><span class="bold">Quote: </span><br />'; //the next few lines do the parsing for quote blocks. We 
        $close = '</blockquote>';                                      //have to do it outside the normal parsing arrays because that way does not allow nesting.

        preg_match_all ('/\[quote\]/i', $str, $matches);
        $opentags = count($matches['0']);

        preg_match_all ('/\[\/quote\]/i', $str, $matches);
        $closetags = count($matches['0']);

        $unclosed = $opentags - $closetags;
        for ($i = 0; $i < $unclosed; $i++) {
                $str .= '</blockquote>';
        }
//Do Quotes (nested)
        $str = str_replace ('[quote]', $open, $str);
        $str = preg_replace('/\[quote\=(.*?)\]/is','<blockquote class="darkbg"><span class="bold left">Quote: $1</span><br />', $str);
        $str = str_replace ('[/quote]', $close, $str);
return $str;

Peace.

answered Feb 12, 2011 at 5:53

TylerT

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1 Comment

Krzysztof Wołowski Over a year ago

You took care about unclosed tags. What if unopened ones exist as well?

Community · Accepted Answer · 2017-05-23 12:02:01Z

1

See here: Recursive patterns on the PHP manual.

This may also interest you, though it's more of a technicality: Why is recursive regex not regex?

edited May 23, 2017 at 12:02

CommunityBot

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answered Jul 9, 2010 at 22:44

Artefacto

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