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.

For reference here is an example of a horrible, but valid title:

  • Some¬`!"£$^&*()_+-=~?/.,;:'@

Things you can't use in titles:

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


# 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]+;' .

This page was moved from mw:Help:Bad title. It's edit history can be viewed at Help:Bad title/edithistory