搜索脚本不查找单个单词

我使用下面的脚本为我的HTML网站搜索。

我遇到的问题是，当我希望它在整个XML中独立搜索单词时，它将单词作为一个短语一起搜索。例如，如果有人输入"数字制作人"，它会搜索"数字制作人"，而不是分别搜索"数字"answers"制作人"。

任何帮助得到这个工作将非常感激!

$(document).ready(function(){
//GLOBAL VAR
var XMLSource = $('#data').attr('xmlData');
var keyword = '';
var catType = '';
var pub = '';
var i = 0;
$("#searchButton").click(function() {
    keyword = $("input#term").val();
    catType = $("#category option:selected").val();
    //Reset any message
    var errMsg = '';
    pub = '';
    if ( keyword == '' ) { errMsg += 'Please Enter Search Term' + ''n'; }
    else if ( catType == 'none' ) { errMsg += 'Please Select Category' + ''n'; }
    else { searchThis(); }
    if ( errMsg != '' ) {
        pub += '<div class="error">' + ''n';
        pub += errMsg;
        pub += '</div>' + ''n';
    }
    //Show error
    $('#result').html( pub );
});
function searchThis() {             
    $.ajax({
        type: "GET",
        url: XMLSource,
        dataType: "xml",
        success: function(xml) { loadPublication (xml) }    
    });
}
function loadPublication (xmlData) {
    i = 0;
    var row;
    var searchExp = "";
    $(xmlData).find('Job').each(function(){
        var SearchTitle = $(this).find('SearchTitle').text();
        var Description = $(this).find('Description').text();
        var EmailTo = $(this).find('EmailTo').text();
        //Format the keyword expression
        var exp = new RegExp(keyword,"gi");
        //Check if there is a category selected; 
        //if not, use EmailTo column as a default search
        if ( catType == 'SearchTitle' ) { searchExp = SearchTitle.match(exp); }
        else if ( catType == 'Description' ) { searchExp = Description.match(exp); }
        else if ( catType == 'EmailTo' ) { searchExp = EmailTo.match(exp); }
        if ( searchExp != null ) {
            //Start building the result
            if ((i % 2) == 0) { row = 'even'; }
            else { row = 'odd'; }
            i++;                
            pub += '<tr class="row ' + row + '">' + ''n';
            pub += '<td valign="top" class="col1">' + SearchTitle + '</td>' + ''n'; 
            pub += '<td valign="top" class="col2">' + Description + '</td>' + ''n'; 
            pub += '<td valign="top" class="col3">' + EmailTo + '</td>' + ''n'; 
            pub += '</tr>' + ''n';
        }   
    });
    if ( i == 0 ) {
        pub += '<div class="error">' + ''n';
        pub += 'No Result Found' + ''n';    
        pub += '</div>' + ''n';
        //Populate the result
        $('#result').html( pub );
    }
    else {
        //Pass the result set
        showResult ( pub );
    }
}
function showResult (resultSet) {
    //Show the result
    pub = '<table id="grid" border="0">' + ''n';
    pub += '<thead><tr>' + ''n';
    pub += '<th class="col1">Job Title</th>' + ''n';
    pub += '<th class="col2">Job Description</th>' + ''n';
    pub += '<th class="col3">Apply To</th>' + ''n';
    pub += '</tr></thead>' + ''n';
    pub += '<tbody>' + ''n';
    pub += resultSet;
    pub += '</tbody>' + ''n';
    pub += '</table>' + ''n';
    //Populate 
    $('#result').html(pub)
    $('#grid').tablesorter(); 
}
});