BBCode

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

Tags
Example in HTML/CSS BBCode Output
<b>bolded text</b>[2],
<strong>bolded text</strong>[1] or
<span style="font-weight: bold;">bolded text</span>		 [b]bolded text[/b] bolded text
<i>italicized text</i>,
<em>italicized text</em> or
<span style="font-style: italic;">italicized text</span>		 [i]italicized text[/i] italicized text
<ins>underlined text</ins> or
<span style="text-decoration: underline;">underlined text</span>		 [u]underlined text[/u] underlined text
<del>strikethrough text</del> or
<span style="text-decoration: line-through;">strikethrough text</span>		 [s]strikethrough text[/s] strikethrough text
<a href="https://en.wikipedia.org">https://en.wikipedia.org</a>
<a href="https://en.wikipedia.org">English Wikipedia</a>		 [url]https://en.wikipedia.org[/url]
[url=https://en.wikipedia.org]English Wikipedia[/url]		 https://en.wikipedia.org
English Wikipedia
<img src="https://upload.wikimedia.org/wikipedia/commons/7/70/Example.png" alt="Example.png" /> [img]https://upload.wikimedia.org/wikipedia/commons/7/70/Example.png[/img]
<img src="Smileys/Face-smile.svg" alt=":-)"> :) or [:-)]
This would be another way to use the [img]url_img[/img] and must be pre-configured by the forum administrator.
(This and other emoticons, depending on the variant. Most BBCodes do not enclose emoticons in square brackets, leading to frequent accidental usage.)		 :-)
(Specific image and size vary.)
<blockquote><p>quoted text</p></blockquote>
(Usually implemented in more advanced ways.)		 [quote]quoted text[/quote]
[quote="author"]quoted text[/quote]
(including optional author)		 Using a Wikipedia template:

quoted text

quoted text

— author
<pre>monospaced text</pre> [code]monospaced text[/code] monospaced text
<span style="font-size:30px">Large Text</span> or
<span style="font-size:85%">Smaller Text</span>		 [style size="30px"]Large Text[/style]
[style size="85"]Smaller Text[/style]
(The unit of measurement varies with each BBCode variant and could represent pixels, points, or relative HTML sizes.)		 Large Text
Smaller Text
<span style="color:fuchsia;">Text in fuchsia</span> or
<span style="color:#FF00FF;">Text in fuchsia</span>		 [style color="fuchsia"]Text in fuchsia[/style] or
[style color=#FF00FF]Text in fuchsia[/style] or
[color=#FF00FF]Text in fuchsia[/color]
(Both HTML color names and hexadecimal color values are generally supported, although on some boards, you must omit the # from selecting a hexadecimal color.)		 Text in fuchsia
<ul>
  <li>Entry A</li>
  <li>Entry B</li>
</ul>

<ol>
  <li>Entry 1</li>
  <li>Entry 2</li>
</ol>

[list]
  [*]Entry A
  [*]Entry B
[/list]

[list=1]
  [*]Entry 1
  [*]Entry 2
[/list]

Some message boards do not need the square brackets around the markers.[3]

(Many variants for li and /li, list types – unordered and ordered, with different bullets or counter formats – etc.)
  • Entry A
  • Entry B
  1. Entry 1
  2. Entry 2
<table>
<tr>
  <td>table cell 1</td>
  <td>table cell 2</td>
</tr>
<tr>
  <td>table cell 3</td>
  <td>table cell 4</td>
</tr>
</table>

[table]
[tr]
  [td]table cell 1[/td]
  [td]table cell 2[/td]
[/tr]
[tr]
  [td]table cell 3[/td]
  [td]table cell 4[/td]
[/tr]
[/table]

(Some variants for thead, rules, etc.)
table cell 1 table cell 2
table cell 3 table cell 4

[4]

Implementation

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].

See also

References
  1. "Why modern forums are switching from HTML to BBCode". LovelyReality.com. Archived from the original on 2018-09-01. Retrieved 24 May 2015.
  2. "HTML Text Formatting". www.w3schools.com. Retrieved 2021-05-01.
  3. e.g. BOINC Project Forums et al.
  4. "BBCode tags reference". www.bbcode.org. Retrieved 12 January 2022.
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