正则表达式从字符串中过滤掉日期时间

Question

要求：我收到一封带有模板的电子邮件，我需要从电子邮件中过滤掉一些文本。我正在将所有电子邮件正文文本转换为字符串。

电子邮件正文如下所示：

some body text which I don't need 

Discussion:
Tue 26/04/2022/2:48 PM UTC+10/ ABC User-

TEST description - this should be logged as a comment.  --- This is the part I need

ABC Company Australia | XYZ St | Sydney NSW 2000

我正在考虑使用正则表达式来查找

一个词“讨论”
下一行查找日期时间格式为“Tue 26/04/2022/2:48 PM UTC+10/ ABC User-”
拿起下一行，直到我们找到这一行 - “ABC Company Australia | XYZ St | Sydney NSW 2000”地址

可能吗？有人可以帮助正则表达式吗？

TIA。

Answer 1

您可以试试这个正则表达式：

Discussion.*?\n+([A-Za-z]+ +(?:\d{2}\/){2}\d{4}\/\d+:\d+ +[^\n]+)(.*)?ABC Company Australia \| XYZ St \| Sydney NSW 2000

解释：

Discussion.*?\n+ 正则表达式从字符串 Discussion 开始的地方开始。
.*?\n+ 一直在寻找额外的单词和换行符
([A-Za-z]+ +(?:\d{2}\/){2}\d{4}\/\d+:\d+ +[^\n]+) 接下来它会按照您描述的那样查找日期格式。它将获取所有内容，直到到达换行符 [^\n+]
(.*)?它将获取上一个日期行的所有内容
ABC Company Australia \| XYZ St \| Sydney NSW 2000 并且会找到就结束匹配。
这里我保留了组 1 中的日期格式行和正文第 2 组需要

Demo

来源：

const regex = /Discussion.*?\n+([A-Za-z]+ +(?:\d{2}\/){2}\d{4}\/\d+:\d+ +[^\n]+)(.*)?ABC Company Australia \| XYZ St \| Sydney NSW 2000/gms;

const str = `some body text which I don't need 

Discussion:
Tue 26/04/2022/2:48 PM UTC+10/ ABC User-

TEST description - this should be logged as a comment.  --- This is the part I need

ABC Company Australia | XYZ St | Sydney NSW 2000
`;

var match = regex.exec(str);
if(match!=null){
console.log(match[1]);
console.log(match[2]);
}

Answer 2

如果只是关于 OP 感兴趣的内容，下面的正则表达式就足够了...... /Discussion:\n[a-zA-Z]{1,3}\s+\d{2}\/\d{2}\/\d{4}.*\n+(?<content>.*)/

const multilineMail = `Discussion:
Tue 26/04/2022/2:48 PM UTC+10/ ABC User-

TEST description - this should be logged as a comment.  --- This is the part I need

ABC Company Australia | XYZ St | Sydney NSW 2000`;


// see ... [https://regex101.com/r/v8FXCA/3]
const regXMailContent =
  /Discussion:\n[a-zA-Z]{1,3}\s+\d{2}\/\d{2}\/\d{4}.*\n+(?<content>.*)/;

console.log(
  regXMailContent.exec(multilineMail)?.groups?.content
);

如果公司页脚必须完全匹配，则必须使其成为上述正则表达式的一部分，如下所示... /Discussion:\n[a-zA-Z]{1,3}\s+\d{2}\/\d{2}\/\d{4}.*\n+(?<content>.*)\n+ABC Company Australia \| XYZ St \| Sydney NSW 2000/

const multilineMail = `Discussion:
Tue 26/04/2022/2:48 PM UTC+10/ ABC User-

TEST description - this should be logged as a comment.  --- This is the part I need

ABC Company Australia | XYZ St | Sydney NSW 2000`;


// see ... [https://regex101.com/r/v8FXCA/4]
const regXMailContent =
  /Discussion:\n[a-zA-Z]{1,3}\s+\d{2}\/\d{2}\/\d{4}.*\n+(?<content>.*)\n+ABC Company Australia \| XYZ St \| Sydney NSW 2000/;

console.log(
  regXMailContent.exec(multilineMail)?.groups?.content
);

如果 OP 还想保存日期和用户，可以增强第一个提供的正则表达式，例如...

const multilineMail = `Discussion:
Tue 26/04/2022/2:48 PM UTC+10/ ABC User-

TEST description - this should be logged as a comment.  --- This is the part I need

ABC Company Australia | XYZ St | Sydney NSW 2000`;


// see ... [https://regex101.com/r/v8FXCA/2]
const regXMailDateAndContent =
  /Discussion:\n(?<date>[a-zA-Z]{1,3}\s+\d{2}\/\d{2}\/\d{4}).*\n+(?<content>.*)/;

// see ... [https://regex101.com/r/v8FXCA/1]
const regXMailDateUserAndContent =
  /Discussion:\n(?<date>[a-zA-Z]{1,3}\s+\d{2}\/\d{2}\/\d{4}\/[^/]+)\/\s*(?<user>.*?)-?\s*\n+(?<content>.*)/;

console.log(
  regXMailDateAndContent.exec(multilineMail)?.groups
);
console.log(
  regXMailDateUserAndContent.exec(multilineMail)?.groups
);

.as-console-wrapper { min-height: 100%!important; top: 0; }

但如果要提取的内容是多行文本，正则表达式必须以公司为特征footer 以识别正确的匹配项。然后第二个提供的正则表达式变为 ... /Discussion:\n[a-zA-Z]{1,3}\s+\d{2}\/\d{2}\/\d{4}.*\n+(?<content>(?:.*\n)*)ABC Company Australia \| XYZ St \| Sydney NSW 2000/

const multilineMail = `Discussion:
Tue 26/04/2022/2:48 PM UTC+10/ ABC User-

TEST

description - this should be
logged as a comment.  --- This is

the part I need


ABC Company Australia | XYZ St | Sydney NSW 2000`;


// see ... [https://regex101.com/r/v8FXCA/5]
const regXMailMultilineContent =
  /Discussion:\n[a-zA-Z]{1,3}\s+\d{2}\/\d{2}\/\d{4}.*\n+(?<content>(?:.*\n)*)ABC Company Australia \| XYZ St \| Sydney NSW 2000/;

console.log(
  regXMailMultilineContent.exec(multilineMail)?.groups?.content
);

.as-console-wrapper { min-height: 100%!important; top: 0; }

以上所有正则表达式模式都使用了 named capturing groups.

正则表达式从字符串中过滤掉日期时间

Regex to filter out Datetime time from string

javascript

regex

string

match

电子邮件正文如下所示：