我把这段文字存储在一个名为description的变量中：

`This is a code update`


*Official Name:

*Pub:

*Agency:

*Reference: https://docs.google.com/document/d/1FFTgytIIcMYnCCgp2cKuUWIwdz7MFolLzCci_-OQn9c/edit#heading=h.81ay6ysgrxtb
https://docs.google.com/document/d/1FFTgytIIcMYnCCgp2cKuUWIwdz7MFolLzCci_-OQn9c/edit#heading=h.81ay6ysgrxtb

*Citation: rg


*Draft Doc Title:

*Draft Source Doc:

*Draft Drive:


*Final Doc Title:

*Final Source Doc:

*Final Drive:
    
*Effective Date:

使用下面的代码，它返回一个包含两个元素的数组：

//3. Extract Reference    
var reference = description.search("Reference");
if(reference != -1){        
    reference = description.match(/(?<=^\*\s*Reference\s*:)[\s]*[\n]*.*?(?=\n\*)/ms);   
    reference  = reference?.[0].trim();  
    reference = reference.split(/[\r\n]+/);        
}else{
    reference = '';
}
console.log('Reference:');
console.log(reference);

输出：
[”https://docs.google.com/document/d/1FFTgytIIcMYnCCgp2cKuUWIwdz7MFolLzCci_-OQn9c/edit#heading=h.81ay6ysgrxtb“，“https：//docs.google.com/document/d/1FFTgytIIcMYnCCgp2cKuUWIwdz7MFolLzCci_-OQn 9 c/编辑#标题=h.81ay6ysgrxtb”]
但是，当我将描述文本更改为：

`This is a code update`   

*Official Name:

*Pub:

*Agency:

*Reference: 

*Citation: rg


*Draft Doc Title:

*Draft Source Doc:

*Draft Drive:


*Final Doc Title:

*Final Source Doc:

*Final Drive:


*Effective Date:

代码返回*Citation: rg。它应该返回一个空字符串。我哪里错了？谢谢。