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WordPress Special Characters in Usernames – WordPress ...

    https://wordpress.org/plugins/wordpress-special-characters-in-usernames/
    Per default WordPress does not allow to use special characters in usernames. Non-latin characters are silently filtered out and your users cannot create accounts containing cyrillic (russian) or arabic letters. This plugin is the solution to this problem. The plugin works for users that are added by the administrator, for users that register with their username/password and for users that register using our Social Login plugin for WordPress.5/5(14)

validate_username() Function WordPress Developer Resources

    https://developer.wordpress.org/reference/functions/validate_username/
    function validate_username( $username ) { $sanitized = sanitize_user( $username, true ); $valid = ( $sanitized == $username && ! empty( $sanitized ) ); /** * Filters whether the provided username is valid. * * @since 2.0.1 * * @param bool $valid Whether given username is valid. * @param string $username Username to check.

multisite - WordPress Development Stack Exchange

    https://wordpress.stackexchange.com/questions/22056/where-can-i-find-documentation-on-what-characters-are-allowed-in-user-names-and
    You can use spaces in usernames, no problem. Several users on wordpress.org have spaces in their usernames. Strict mode only allows these characters: a-z0-9<space>_.\[email protected] However WP doesn't default to strict mode. Now, multisite has different restrictions, and it …

Topic: What can the username contain and how many letters ...

    https://buddypress.org/support/topic/what-can-the-username-contain-and-how-many-letters-what-characters-etc/
    sanitize_user () is used on the username at signup time so it should be alphanumeric characters plus _ space. – * and @.

Function Reference/validate username « WordPress Codex

    https://codex.wordpress.org/Function_Reference/validate_username
    Checks whether username is valid. Note: this function attempts to sanitize the username, and if it "passes", the name is considered valid. For additional logic, you can use the 'validate_username' hook. Usage <?php validate_username ( $username ) ?> Parameters $username (required) Username. Default: None Return Values (boolean)

limit - Wordpress User Name Limitations - WordPress ...

    https://wordpress.stackexchange.com/questions/99475/wordpress-user-name-limitations
    Wordpress User Name Limitations. Ask Question Asked 7 years, 6 months ago. Active 6 years, 6 months ago. ... In 2016 I still confirm what @s_ha_dum said: everyone can use an username formed by only 1 character. – Marco Panichi Apr 7 '16 at 6:17. add a comment Your Answer
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