"HTML/UBB conversion" refers to translating between HTML (standard web markup language) and UBB (Ultimate Bulletin Board code, often called BBCode).
UBB or BBCode is a lightweight markup language used mainly on forums to allow users to format their posts safely without using raw HTML.
Security: Prevent users from inserting malicious HTML or scripts by using a safer, limited set of formatting tags.
Simplified Formatting: Let non-technical users format text (bold, italic, links, images) without needing to know HTML.
Compatibility: Convert UBB posts into proper HTML for display in web browsers.
Standardization: Enforce consistent styling and reduce the chance of broken layouts or unsafe code.
Parse UBB codes (like [b]bold[/b], [url]link[/url]) and translate them into equivalent HTML tags (<strong>bold</strong>, <a href="link">link</a>).
Use a conversion library or write a parser script (in PHP, JavaScript, Python, etc.) that replaces UBB patterns with HTML output.
Optionally, do the reverse: convert HTML into UBB format for editing in a user-friendly environment.
When building or maintaining forums, message boards, or comment sections where users need simple text formatting.
When you need to sanitize user input but still allow rich text styling.
When migrating or integrating legacy systems that used UBB/BBCode into modern web platforms.
When designing editor interfaces that accept BBCode input and display HTML previews.