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$bad_name = array($stringofbadwords);
$forbidden_name = array ('nigger','ngr','niiger');

function userNameValid($name_in) {
  $badFound = preg_match("/\b(" . implode("|",$bad_name) . ")\b/i", $name_in); // checks array for exact match
  $forbiddenFound = preg_match("/(" . implode("|",$forbidden_name) . ")/i", $name_in); // checks array for any character match with a given name (i.e. "ass" would be found in assassin)