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   1. drupal6
   2. drupal7

Verify the syntax of the given name.

Code

modules/user/user.module, line 382

<?php
function user_validate_name($name) {
  if (!strlen($name)) {
    return t('You must enter a username.');
  }
  if (substr($name, 0, 1) == ' ') {
    return t('The username cannot begin with a space.');
  }
  if (substr($name, -1) == ' ') {
    return t('The username cannot end with a space.');
  }
  if (strpos($name, '  ') !== FALSE) {
    return t('The username cannot contain multiple spaces in a row.');
  }
  if (preg_match('/[^\x{80}-\x{F7} a-z0-9@_.\'-]/i', $name)) {
    return t('The username contains an illegal character.');
  }
  if (preg_match('/[\x{80}-\x{A0}' .          // Non-printable ISO-8859-1 + NBSP
                   '\x{AD}' .                 // Soft-hyphen
                   '\x{2000}-\x{200F}' .      // Various space characters
                   '\x{2028}-\x{202F}' .      // Bidirectional text overrides
                   '\x{205F}-\x{206F}' .      // Various text hinting characters
                   '\x{FEFF}' .               // Byte order mark
                   '\x{FF01}-\x{FF60}' .      // Full-width latin
                   '\x{FFF9}-\x{FFFD}' .      // Replacement characters
                   '\x{0}-\x{1F}]/u',         // NULL byte and control characters
                   $name)) {
    return t('The username contains an illegal character.');
  }
  if (drupal_strlen($name) > USERNAME_MAX_LENGTH) {
    return t('The username %name is too long: it must be %max characters or less.', array('%name' => $name, '%max' => USERNAME_MAX_LENGTH));
  }
}
?>