Regex BBCode to HTML

Question

I writing BBcode converter to html.
Converter should skip unclosed tags.

I thought about 2 options to do it:
1) match all tags in once using one regex call, like

Answer 1

One option would be to use more SAX-like parsing, where instead of looking for a particular regex you look for [, then have your program handle that even in some manner, look for the ], handle that even, etc. Although more verbose than the regex it may be easier to understand, and wouldn't necessarily be slower.