src/Zend/Filter/Word/Separator/Abstract.php
public function setSeparator($separator)
    {
        if ($separator == null) {

            throw new Zend_Filter_Exception('"' . $separator . '" is not a valid separator.');
        }
        $this->_separator = $separator;
        return $this;
    }
public function setSeparator($separator)
    {
        if ($separator == null) {

            throw new Zend_Filter_Exception('"' . $separator . '" is not a valid separator.');
        }
        $this->_separator = $separator;
        return $this;
    }
Sets a new seperator

@param  string  $separator  Seperator
@return $this