Copy and paste the web address you'll understand BBcode a little better
http://www.stumbleupon.com/s/#30rxoq/en.wikipedia.org/wiki/BBCode/
Purpose
BBCode was devised to provide a safer, easier and more limited way of allowing users to format their messages. Previously, many message boards allowed the users to include HTML formatting, a side effect of which was that malformed HTML could disrupt the page's layout, or HTML could be used to run JavaScript leading to XSS attacks. Some implementations of BBCode have suffered problems related to the way they translate the BBCode into HTML, which could negate the security that was intended to be given by BBCode. An alternative is a properly written HTML filter (many of which are freely available).
Although the basic tags of BBCode are similar in most internet forum software, there is currently no standards document for BBCode and there are consequently many incompatible variants. Some variants are case-sensitive while others are not. Some variants have tags which highlight the formatting of HTML, ASP, PHP, SQL and other markup languages and programming languages.
BBCode tags
The following are the most common BBCode tags available to most modern message boards, and are displayed here with their HTML equivalents. However, it should be noted that the effect of these tags can be changed substantially, and the effect may not be identical on all sites using BBCode.
HTML and BBCode have difficulties together
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