如何使用 regex_search 从两个不同的 .txt 文件中获取一行文本
我正在尝试在 c++ 中使用此正则表达式模式 Subject: [\a-zA-Z_0-9]+ 从两个不同的文件中获取这一行文本，一个是这样的：
Message-ID: <..>
Subject: AAAI-22 General Information
MIME-Version: 1.0
Content-Type: multipart/alternative; ..
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable
另一个
Subject: Re: Possible need for … 240
Thread-Topic: Possible need for printout for .. 240
是，正则表达式模式匹配：
Subject: AAAI-22 General Information MIME-Version: 1.0
Content-Type: multipart/alternative; ..Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable
对于第一个文本文件和第二个文件，模式匹配
Subject: Re: Possible need for
我希望我的正则表达式模式搜索并打印出来的是 Subject: 以及该行中的其他内容以及没有别的。如何使用 regex_search 和 regex_replace 模式来做到这一点？
I'm trying to use this regex pattern Subject: [\a-zA-Z_0-9]+ in c++ to get this line of text from two different files one being this:
Message-ID: <..>
Subject: AAAI-22 General Information
MIME-Version: 1.0
Content-Type: multipart/alternative; ..
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable
and the other being
Subject: Re: Possible need for … 240
Thread-Topic: Possible need for printout for .. 240
however, the regex pattern matches:
Subject: AAAI-22 General Information MIME-Version: 1.0
Content-Type: multipart/alternative; ..Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable
for the first text file and for the second file the pattern matches
Subject: Re: Possible need for
All I want my regex pattern to search for and print out is the Subject: and whatever else is in that line and nothing else. How can I do that using regex_search and regex_replace patterns?
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您可以使用此正则表达式模式来搜索主题行
说明：
Subject:与字符Subject:字面匹配（大小写敏感）。
.匹配任何字符（行终止符除外）+匹配前一个标记一次到无限次You can use this regex pattern to search for Subject line
Explanation:
Subject:matches the charactersSubject:literally (casesensitive).
.matches any character (except for line terminators)+matches the previous token between one and unlimited times