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BBCode ("Bulletin Board Code") is a lightweight markup language used to format messages in many Internet forum software. It was first introduced in 1998.cite-ref-1[1] The available "tags" of BBCode are usually indicated by square brackets ([ and ]) surrounding a keyword, and are parsed before being translated into HTML.

• Tags

• Implementation

• See also

• References

• External links

BBCode is typically implemented by applying a series of regular expression string-replace operations upon the input. Because regular expressions are limited in analyzing the structure of text input, this has the artifact that any non-hierarchical BBCode input will be transformed into invalid non-hierarchical HTML without error.

Applying traditional parsing techniques is made difficult by ambiguities in the markup, such as in [quote=[b]text[/b][/quote], where the input can either be interpreted as "text" quoted from someone called [b, or the bolded text "text" surrounded by [quote= and [/quote], i.e. [quote=text[/quote].

• Markdown

cite-note-11. ↑ "BBCode history". www.bbcode.org. Retrieved 21 February 2025.

cite-note-21. "HTML Text Formatting". W3Schools. Retrieved 2021-05-01.

cite-note-32. e.g. BOINC Project Forums et al.

cite-note-43. "BBCode tags reference". www.bbcode.org. Retrieved 12 January 2022.

• BBCode users guide

• RTF/HTML to BBCode online converter