protected function getParamExpression() {
		if ($this->paramExpression === null) {
			$expr = sprintf(preg_quote($this->paramsPattern, '~'), '(.*?)');
			
			$this->paramExpression = '~' . $expr . '~';
		}
		
		return $this->paramExpression;
	}
protected function getParamExpression() {
		if ($this->paramExpression === null) {
			$expr = sprintf(preg_quote($this->paramsPattern, '~'), '(.*?)');
			
			$this->paramExpression = '~' . $expr . '~';
		}
		
		return $this->paramExpression;
	}
protected function getParamExpression ( ) { if ( $ this -> paramExpression === null ) { $ expr = sprintf ( preg_quote ( $ this -> paramsPattern , '~' ) , '(.*?)' ) ; $ this -> paramExpression = '~' . $ expr . '~' ; } return $ this -> paramExpression ; }
Get search expression

@return string
Get search expression