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<?php
function validate_username( $username ) {
    $sanitized = sanitize_user( $username, true );
    $valid = ( $sanitized == $username );
    return apply_filters( 'validate_username', $valid, $username );
}
?>

• Function Reference/validate username « WordPress Codex
  Description. Checks whether username is valid. Usage. <?php validate_username( $username ) ?> Parameters. $username: (string) (required) Username.
  codex.wordpress.org
• validate_username Wordpress hook details -- Adam Brown, BYU ...
  WordPress hook directory validate_username. Description. Applied to the validation result on a new user name. Filter function arguments: valid (true/false), user ...
  adambrown.info
• php - Validate username as alphanumeric with underscores - Stack ...
  On my registration page I need to validate the usernames as ... The actual matched characters of \w depend on the locale that is being used: ...
  stackoverflow.com
• [#PHPBB3-7208] validate_username with mbstring functions for ...
  I have trouble with validate_username for registration when i limit characters to USERNAME_LETTER_NUM_SPACERS. The check with mb_ereg_search fails ...
  tracker.phpbb.com

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