Invalidate Username with Spaces in BuddyPress

By default, during user registration, if a username contains a space, BuddyPress will automatically replace it with a hyphen. Using this snippet, you can ask users to revise the username by returning an error rather than adding a hyphen without the user’s consent.

add_action( 'bp_loaded','bpdev_remove_bp_pre_user_login_action') ;
 * 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
function bpdev_remove_bp_pre_user_login_action(){
  remove_action( 'pre_user_login', 'bp_core_strip_username_spaces' );
add_filter( 'validate_username','bpdev_restrict_space_in_username',10,2) ;
 * add a filter to invalidate a username with spaces
function bpdev_restrict_space_in_username( $valid,$user_name ){
  //check if there is an space
  if ( preg_match('/\s/',$user_name ) )
  //if yes, then we say it is an error
  return false;
  //otherwise return the actual validity
  return $valid;

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