BuddyPress.org

@ahmedselim https://wordpress.org/extend/plugins/restrict-usernames/

Scott, the plugin author of restrict usernames, is a top-notch developer and I’ve used the plugin successfully in my sites. The plugin is compatible with BuddyPress. Could be conflict with another plugin and/or with theme, there are just so many variables. Have you tried deactivating other plugins except BuddyPress to test restrict usernames plugin?

We used some javascript to automatically convert spaces as user types!

`// sanitize signup field
jQuery(“#signup_username”).keyup(function(){
this.value = this.value.toLowerCase().replace(/ /g, ‘-‘);
}); `

Use this code in your themes functions.php or bp-custom.php courtesy of @sbrajesh:
`
/**
* BuddyPress replaces the space with ‘-‘ which is not known to the user
* We remove the attached function to stop BP from circumventing the space in username
*/
add_action(‘bp_loaded’,’bpdev_remove_bp_pre_user_login_action’);
function bpdev_remove_bp_pre_user_login_action(){
remove_action( ‘pre_user_login’, ‘bp_core_strip_username_spaces’ );
}

//add a filter to invalidate a username with spaces
add_filter(‘validate_username’,’bpdev_restrict_space_in_username’,10,2);
function bpdev_restrict_space_in_username($valid,$user_name){
//check if there is an space
if ( preg_match(‘/\s/’,$user_name) )
return false;//if myes, then we say it is an error
return $valid;//otherwise return the actual validity
}
`