Help:Bad title
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Some page titles are defined as bad for various reasons. You can't create pages with these titles.
For details of what constitutes a bad title, see regex section or Title.php.
For reference here is an example of a horrible, but valid title:
- Some¬`!"£$^&*()_+-=~?/.,;:'@
Things you can't use in titles:
- The following standard CGI chars are not good:
- https://www.mediawiki.org/wiki/Some%s — Very bad!
- The following standard wiki syntax seems to work:
- https://www.mediawiki.org/wiki/Some%sSome[s — gets trimmed
- https://www.mediawiki.org/wiki/Some%sSome]s — gets trimmed
- https://www.mediawiki.org/wiki/Some%sSome{s — bad
- https://www.mediawiki.org/wiki/Some%sSome}s — bad
- and some just don't work:
- https://www.mediawiki.org/wiki/Some%sSome#s — gets trimmed
- and some HTML like constructs are very bad, and can't be shown here because they break page formatting:
HTTP Codes
These vary according to the version number of the software:
- 400 (Bad Request) for v1.19.1 and above
- 200 (OK) for v1.16.4 and earlier
Regex
# Matching titles will be held as illegal.
$rxTc = '/' .
# Any character not allowed is forbidden.
'[^' . self::legalChars() . ']' .
# URL percent encoding sequences interfere with the ability to round-trip titles, you can't link to them consistently.
'|%[0-9A-Fa-f]{2}' .
# XML/HTML character references produce similar issues.
'|&[A-Za-z0-9\x80-\xff]+;' .
'|&#[0-9]+;' .
'|&#x[0-9A-Fa-f]+;' .
'/S';