提问人：alyssaeliyah 提问时间：3/10/2023 最后编辑：Peter Seligeralyssaeliyah 更新时间：3/15/2023 访问量：67
Javascript 中的正则表达式 - 在标签后查找多行文本
Regular Expressions in Javascript - Find Multiple Lines of Text After a Tag
问：
我将下面的文本存储在变量中：description
This is a code update
Official Name: None
Pub: https://content.upcodes.co/viewer/washington/wa-mechanical-code-2021
Agency:
Reference: https://web.archive.org/web/20230226234118/https://lawfilesext.leg.wa.gov/law/wsr/agency/BuildingCodeCouncil.htm
Citation: WAC 51-52 / WSR 23-02-055
Draft Doc Title: WSR 23-02-055 (#1)
Draft Source Doc: https://web.archive.org/web/20230303022030/https://lawfilesext.leg.wa.gov/law/wsr/2023/02/23-02-055.htm (#1)
Draft Drive: https://drive.google.com/file/d/1pYmwQS3t-ZX-Vyg9yBabtIpXZ7By2G6f/view?usp=share_link ( #1)
Final Doc Title:
IECC Com Update(#1)
IECC Res Update (#2)
Final Source Doc: https://web.archive.org/web/20230303022130/https://apps.leg.wa.gov/wac/default.aspx?cite=51-52&full=true&pdf=true (#1)
https://web.archive.org/web/20230303022030/https://lawfilesext.leg.wa.gov/law/wsr/2023/02/23-02-055.htm (#2)
Final Drive: https://web.archive.org/web/20230303022130/https://apps.leg.wa.gov/wac/default.aspx?cite=51-52&full=true&pdf=true (#1)
https://web.archive.org/web/2023030302fdfdfg2130/https://apps.legfdg.gov/wac/default.aspx?cite=51-52&fdsfullfdsf=true&pfdsfdf=true (#2)
Effective Date: January 4, 2023
我想在“Final Doc Title：”标签之后提取信息。它应该给我两个值。第一个值是 和 。我在下面有一个代码，可以提取标签后面的文本，直到找到新的行字符。IECC Com Update(#1)IECC Res Update (#2)
//8. Extract Final Doc Title
var final_doc_title = description.search("Final Doc Title:");
if(final_doc_title != -1){
final_doc_title = description.match(/(?<=^Final Doc Title:)[^\n\r]+/m);
final_doc_title = final_doc_title?.[0].trim();
}else{
final_doc_title = '';
}
console.log('Final Doc Title: ' + final_doc_title);
此代码的问题在于它返回一个空字符串，因为在“Final Doc Title：”之后有一个换行符。
Final Doc Title:\n
IECC Com Update(#1)\n
IECC Com Update(#1)\n
我将如何修改我的代码以返回两行？谢谢！
答：
2赞
trincot
3/10/2023
#1
您可以将这些换行符与 匹配，假设您对要查找的文本前面的空格不感兴趣。\s*
如果要查找的文本在带有冒号的行（如 中）之前结束，则可以执行以下操作：Final Source Doc: https:....
const description = "This is a code update\n\nOfficial Name: None\n\nPub: https://content.upcodes.co/viewer/washington/wa-mechanical-code-2021\n\nAgency: \n\nReference: https://web.archive.org/web/20230226234118/https://lawfilesext.leg.wa.gov/law/wsr/agency/BuildingCodeCouncil.htm\n\nCitation: WAC 51-52 / WSR 23-02-055\n\nDraft Doc Title: WSR 23-02-055 (#1)\n\nDraft Source Doc: https://web.archive.org/web/20230303022030/https://lawfilesext.leg.wa.gov/law/wsr/2023/02/23-02-055.htm (#1)\n\nDraft Drive: https://drive.google.com/file/d/1pYmwQS3t-ZX-Vyg9yBabtIpXZ7By2G6f/view?usp=share_link ( #1)\n\nFinal Doc Title: \n\nIECC Com Update(#1)\n\nIECC Res Update (#2)\n\nFinal Source Doc: https://web.archive.org/web/20230303022130/https://apps.leg.wa.gov/wac/default.aspx?cite=51-52&full=true&pdf=true (#1)\n\nhttps://web.archive.org/web/20230303022030/https://lawfilesext.leg.wa.gov/law/wsr/2023/02/23-02-055.htm (#2)\n\nFinal Drive: https://web.archive.org/web/20230303022130/https://apps.leg.wa.gov/wac/default.aspx?cite=51-52&full=true&pdf=true (#1)\n\nhttps://web.archive.org/web/2023030302fdfdfg2130/https://apps.legfdg.gov/wac/default.aspx?cite=51-52&fdsfullfdsf=true&pfdsfdf=true (#2)\n\nEffective Date: January 4, 2023\nI want to extract the information after 'Final Doc Title:' tag. It should give me two values. The first value is IECC Com Update(#1) and IECC Res Update (#2). I have a code below that extracts the text after the tag until a new line character is found.\n\n//8. Extract Final Doc Title";
var result = description.match(/^Final Doc Title:\s*((?:\s*^(?:[^:\r\n]*)$)*)/m)?.[1];
var parts = result?.match?.(/.+/gm);
console.log(parts);
2赞
Peter Seliger
3/10/2023
#2
一个简单的多行仅标记正则表达式，如下所示......
/^Final Doc Title:\s+(.+)\s+(.+)/m
...它具有 2 个捕获组（它们不一定被命名）已经完成了这项工作。
const regXDocTitles = /^Final Doc Title:\s+(.+)\s+(.+)/m;
const sampleText =
`This is a code update
Draft Source Doc: https://web.archive.org/web/20230303022030/https://lawfilesext.leg.wa.gov/law/wsr/2023/02/23-02-055.htm (#1)
Draft Drive: https://drive.google.com/file/d/1pYmwQS3t-ZX-Vyg9yBabtIpXZ7By2G6f/view?usp=share_link ( #1)
Final Doc Title:
IECC Com Update(#1)
IECC Res Update (#2)
Final Source Doc: https://web.archive.org/web/20230303022130/https://apps.leg.wa.gov/wac/default.aspx?cite=51-52&full=true&pdf=true (#1)
Final Drive: https://web.archive.org/web/20230303022130/https://apps.leg.wa.gov/wac/default.aspx?cite=51-52&full=true&pdf=true (#1)
Effective Date: January 4, 2023`;
console.log(
sampleText?.match(regXDocTitles)
)
console.log(
sampleText?.match(regXDocTitles)?.slice(-2)
).as-console-wrapper { min-height: 100%!important; top: 0; }
评论
/(?<=^Final Doc Title:\s*\n).*(?:\r?\n.*)?/m.\r[^\r\n].