Title: Prohibited usernames case sensitive Last modified: July 30, 2020 --- # Prohibited usernames case sensitive * Resolved [Johan WALTER](https://wordpress.org/support/users/johan_walter/) * (@johan_walter) * [5 years, 10 months ago](https://wordpress.org/support/topic/prohibited-usernames-case-sensitive/) * Hi * I have created a list of prohitbited usernames Screenshot [https://prnt.sc/tr93qs](https://prnt.sc/tr93qs) * One IP has been blocked using one of this username An other IP used the same username in uppercase letter , it has not been blocked as use of prohibited usernames but considered as attempt with non existing login Screenshot [https://prnt.sc/tr9340](https://prnt.sc/tr9340) * I have tried to add the username in uppercase letter in prihibited usernames, it does not work, the username is not saved probably because same username in lower case is already in the list * Is there any chance you can solve it ? * Either by making prohibited username list case sentive or blocking IP trying to login with a username whatever is used lowercase or uppercase I prefer second option * Thanks * Regards * Johna Viewing 11 replies - 1 through 11 (of 11 total) * Plugin Author [gioni](https://wordpress.org/support/users/gioni/) * (@gioni) * [5 years, 10 months ago](https://wordpress.org/support/topic/prohibited-usernames-case-sensitive/#post-13216483) * Hi! * 1. All usernames specified without using REGEX are case-sensitive. 2. For consistency reasons, all entries in the list must be lowercase. 3. To specify prohibited usernames in a case-insensitive manner, you need to use REGEX. For instance for the **admin** username specify **/admin/**. It will work for any case used by an offender. * Thread Starter [Johan WALTER](https://wordpress.org/support/users/johan_walter/) * (@johan_walter) * [5 years, 10 months ago](https://wordpress.org/support/topic/prohibited-usernames-case-sensitive/#post-13216507) * Hi * Thanks I will update my list with Regex * Regards * Johan * Thread Starter [Johan WALTER](https://wordpress.org/support/users/johan_walter/) * (@johan_walter) * [5 years, 10 months ago](https://wordpress.org/support/topic/prohibited-usernames-case-sensitive/#post-13216577) * Hi Gioni [@gioni](https://wordpress.org/support/users/gioni/) * I followed your instructions and used Regex Screenshot [https://prnt.sc/tuyz4d](https://prnt.sc/tuyz4d) * It showed the login attemp with prohibited username but it didn’t block the IP Screenshot [https://prnt.sc/tuyxq1](https://prnt.sc/tuyxq1) Previous attemps, without Regex, blocked the IP * I have tried it on 2 websites I changed back to username without Regex and IP is blocked again Screenshot [https://prnt.sc/tuz2cl](https://prnt.sc/tuz2cl) * Is it because the username is in between [ ] ? * Plugin Author [gioni](https://wordpress.org/support/users/gioni/) * (@gioni) * [5 years, 10 months ago](https://wordpress.org/support/topic/prohibited-usernames-case-sensitive/#post-13216593) * Do not use square brackets. * Thread Starter [Johan WALTER](https://wordpress.org/support/users/johan_walter/) * (@johan_walter) * [5 years, 10 months ago](https://wordpress.org/support/topic/prohibited-usernames-case-sensitive/#post-13216654) * It does not work ! The username used by bots to attempt login as square brackets * I have just tried to use /login/ Screenshot [https://prnt.sc/tuzfef](https://prnt.sc/tuzfef) * Username is not prohibited any more, it does not exist and IP is not blocked Screenshot [https://prnt.sc/tuzf3c](https://prnt.sc/tuzf3c) * Plugin Author [gioni](https://wordpress.org/support/users/gioni/) * (@gioni) * [5 years, 10 months ago](https://wordpress.org/support/topic/prohibited-usernames-case-sensitive/#post-13243690) * It’s because your REGEX is wrong. For the username **[login]** it must be **/\[ login\]/** since the login in your example contains square brackets. Anyway, in the upcoming version non-REGEX entries will be processed in a case-insensitive manner. * Plugin Author [gioni](https://wordpress.org/support/users/gioni/) * (@gioni) * [5 years, 10 months ago](https://wordpress.org/support/topic/prohibited-usernames-case-sensitive/#post-13243699) * You can play with REGEX online, e.g. here: [https://regex101.com/](https://regex101.com/) * Thread Starter [Johan WALTER](https://wordpress.org/support/users/johan_walter/) * (@johan_walter) * [5 years, 10 months ago](https://wordpress.org/support/topic/prohibited-usernames-case-sensitive/#post-13243704) * Hi Gioni * Thanks for your answer ! I will wait next version then * Thread Starter [Johan WALTER](https://wordpress.org/support/users/johan_walter/) * (@johan_walter) * [5 years, 9 months ago](https://wordpress.org/support/topic/prohibited-usernames-case-sensitive/#post-13268200) * Hi Gioni * I have updated to latest version It works fine and it is way more practical and efficient than using Regex on username list * That also makes Cerber fully compatible with username availabilty checker from Buddydev [https://buddydev.com/plugins/bpdev-username-availability-checker/](https://buddydev.com/plugins/bpdev-username-availability-checker/) * Thanks for your support * Regards * Johan * Plugin Author [gioni](https://wordpress.org/support/users/gioni/) * (@gioni) * [5 years, 9 months ago](https://wordpress.org/support/topic/prohibited-usernames-case-sensitive/#post-13393586) * You’re welcome! * [vorticy](https://wordpress.org/support/users/vorticy/) * (@vorticy) * [5 years, 5 months ago](https://wordpress.org/support/topic/prohibited-usernames-case-sensitive/#post-13854934) * I still don’t see where to enter these usernames. Viewing 11 replies - 1 through 11 (of 11 total) The topic ‘Prohibited usernames case sensitive’ is closed to new replies. * ![](https://s.w.org/plugins/geopattern-icon/wp-cerber_77a9bf.svg) * [WP Cerber Security, Anti-spam & Malware Scan](https://wordpress.org/plugins/wp-cerber/) * [Frequently Asked Questions](https://wordpress.org/plugins/wp-cerber/#faq) * [Support Threads](https://wordpress.org/support/plugin/wp-cerber/) * [Active Topics](https://wordpress.org/support/plugin/wp-cerber/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/wp-cerber/unresolved/) * [Reviews](https://wordpress.org/support/plugin/wp-cerber/reviews/) * 11 replies * 3 participants * Last reply from: [vorticy](https://wordpress.org/support/users/vorticy/) * Last activity: [5 years, 5 months ago](https://wordpress.org/support/topic/prohibited-usernames-case-sensitive/#post-13854934) * Status: resolved