PHP BBCode formatting with inner BBCode

Question

I developed a class that allows me to have control over many BBCode tags and other special formats and is working well. The issue I'm having is having inner tags the same as an outer tag. For example, a [quote][/quote] within another [quote][/quote] like this:

[quote=Foo]Here is a quote:

[quote=Bar]Test[/quote]

Did that work?[/quote]

The issue is that the regex is finding the inner end [/quote] when it's finding a match for the outer start [quote].

Would I have to split and go line by line to find proper matches or is there an elegant way of doing this?

Here is a small test of how I'm doing it (there is a bit more but functionally this is all it's doing):

$desc = '[quote=Foo]Here is a quote:

[quote=Bar]Test[/quote]

Did that work?[/quote]';

$args = array(
    'tid' => 1234
);

preg_match('`\[(quote)=?(.*?)\]((\r\n|\r|\n|.)+?)\[\/quote\]`i', $desc, $matches);

list($str, $tag, $match, $innertext) = $matches;

$params = explode(';', $match);
$name   = array_shift($params);

$replacement = '<div class="quote">' . $name . '<span class="quote-text">' . $innertext . '</span></div>';

$string = str_replace($str, $replacement, $desc);

Other tags are fine when they are nested within others, just the like tags are finding the match incorrectly.

hwnd · Accepted Answer · 2014-07-30 21:24:25Z

1

Try using a greedy quantifier instead and enable the s dotall modifier.

preg_match('~\[(quote)=?(.*?)\](.+)\[/quote\]~is', $desc, $matches)

Working Demo

edited Jul 30, 2014 at 21:24

answered Jul 30, 2014 at 21:08

hwnd

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4 Comments

Mitchell Simoens Over a year ago

Cool, so that at least doesn't trample over itself which is great. Guess to have a complete solution would be to parse the inner tags recursively also.

hwnd Over a year ago

Yes, you could also use a recursive regex if needed.

Mitchell Simoens Over a year ago

Would I be lucky to have help with that? My regex foo is quite low, know enough to do damage.

Mitchell Simoens Over a year ago

Did you have a chance to look into it?

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