php - preg_match assistance needed -

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hi need assistance changing preg_match check 2-16chars a-z 0-9 -_ , space. right checking url i'd need remove protocol, add space , 2-16 min/max chr.

public function checkurl($string) {     if(empty($string) || preg_match("#^(http|https|ftp)://([a-z0-9][a-z0-9_-]*(?:.[a-z0-9][a-z0-9_-]*)+):?(d+)?/?#i", $string))     {         return true;     }     else     {         if( isset($this) )         {             $this->adderror("input error");         }         return false;     } }

i'm not sure part want change, but...

[need match] 2-16 chars a-z 0-9 -_ , space.

[\w- ]{2,16}
  • \w matches a-z, a-z, 0-9 , _.
  • - match literal - in character class outside of valid range.
  • ' ' match space (ignore quotes, stack overflow needed them display). match whitespace character, use \s.
  • {2,16} quantify match between 2 , 16 times inclusively.
  • you change (http|https|ftp) (?:https?|ftp), won't capture group, aren't using references.

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