MediaWiki:Regexblock-help/en

Use the form below to block write access from a specific IP address or username. This should be done only to prevent vandalism, and in accordance with policy. ''This page will allow you to block even non-existing users, and will also block users with names similar to given, i.e. "Test" will be blocked along with "Test 2" etc. You can also block full IP addresses, meaning that no one logging in from them will be able to edit pages. Note: partial IP addresses will be treated as usernames in determining blocking. If no reason is specified, a default generic reason will be used.''