问preg_match中的转义+符号

EN

function degree_of_interest()
{
    $program = $_REQUEST['degree_of_interest'];  
    $highest_level = $_REQUEST['college_1_degree'];
    $start = $_REQUEST['start_date'];

    if( !preg_match("/\A(1-2 months|3-4 months|6+ months)\Z/i",$start)
     OR !preg_match("/\A(Bachelors)\Z/i",$highest_level)
     OR !preg_match("/\A(JD \(Juris Doctor\))\Z/i",$program))
    {
        $this->errorsArray['degree_of_interest'][] = "For $program you must have a Bachelors degree";
    }

}