It should be noted that rothenbergxxx at gmail dot com's regex will only work for single line $innertext. While this is perfectly fine for the majority of the tags, quote tags need multi-line $innertext.
Here is a fixed version of the regex which supports multi-line $innertext between the opening and closing tags:
preg_match_all('`\[(.+?)=?(.*?)\]([\s\S]+?)\[/\1\]`', $string, $matches)
In my tests, this performs without error. Feel free to post any additional corrections.
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Server IP: 69.147.83.197
Probable Submitter: 121.218.196.174
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Manual Page -- http://www.php.net/manual/en/function.bbcode-create.php
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