javascript - 正则表达式删除字符串中字符的开头到结尾

Question

我有这个字符串:

var string = "From: Jeremy<br />
 Sent: 22 Apr 2016 12:08:03</br />
 To: Mark<br />
 Subject: Another test email<br /><br />

 Hi Mark, 
<br />
I'm sending this email as a way to test the email! 
<br />
Cheers, 
<br />
Jeremy"

我想从开头到“主题”行之后拼接该字符串，以便获得电子邮件正文内容。

到目前为止我已经尝试过:

string.substring(string.lastIndexOf('Subject'), string.length - 1)

但此选项也会从字符串中返回主题行。

有我可以使用的正则表达式库吗？

Answer 1

使用string.replace你可以这样做:

var body = string.replace(/^[\s\S]*\s+Subject: [^\n]*\n+/, '')

代码:

var string = `From: Jeremy<br />
Sent: 22 Apr 2016 12:08:03</br />
To: Mark<br />
Subject: Another test email<br /><br />

Hi Mark, 
<br />
I'm sending this email as a way to test the email! 
<br />
Cheers, 
<br />
Jeremy`

var body = string.replace(/^[\s\S]*\s+Subject: [^\n]*\n+/, '')

document.writeln("<pre>" + body + "</pre>")

[\s\S]* 匹配 0 个或多个任何字符(包括换行符)。其后的 Subject: 行也被删除。

输出:

"Hi Mark, 
<br />
I'm sending this email as a way to test the email! 
<br />
Cheers, 
<br />
Jeremy"