public function where($name, $expression = null)
    {
        foreach ($this->parseWhere($name, $expression) as $name => $expression) {
            $this->wheres[$name] = $expression;
        }

        return $this;
    }
public function where($name, $expression = null)
    {
        foreach ($this->parseWhere($name, $expression) as $name => $expression) {
            $this->wheres[$name] = $expression;
        }

        return $this;
    }
public function where ( $ name , $ expression = null ) { foreach ( $ this -> parseWhere ( $ name , $ expression ) as $ name => $ expression ) { $ this -> wheres [ $ name ] = $ expression ; } return $ this ; }
Set a regular expression requirement on the route.

@param  array|string  $name
@param  string  $expression
@return $this
Set a regular expression requirement on the route .