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//匹配文本中的日期,并将日期转换为标准格式
void dateFormatEx(void)
{
ifstream in(".\\chapter.23.4.1.in", ios::binary);
if (!in)cerr << "no file\n";
boost::regex pat("([\\d]+) ([\\w]+) ([\\d]+)");
cout << "pattern: " << pat << '\n';
int lineno = 0;
string line;
while (getline(in, line))
{
++lineno;
boost::smatch matches;
if (boost::regex_search(line, matches, pat))
{
string day = matches[1];
string mon = matches[2];
string year = matches[3];
line = boost::regex_replace(line, pat, year+"/"+mon+"/"+day);
}
cout << line << endl;
}
}
输入语料
xxx
xxx
From: John Doe [email protected]
To: Mary Smith [email protected]
Subject: Saying Hello
Date: Fri, 21 Nov 1997 09:55:06 -0600
Message-ID: <[email protected]>
This is a message just to say hello.
So, “Hello”.
From: Joe Q. Public [email protected]
To: Mary Smith <@machine.tld:[email protected]>, , jdoe@test .example
Date: Tue, 1 Jul 2003 10:52:37 +0200
Message-ID: <[email protected]>
Hi everyone.
To: “Mary Smith: Personal Account” [email protected]
From: John Doe [email protected]
Subject: Re: Saying Hello
Date: Fri, 21 Nov 1997 11:00:00 -0600
Message-ID: [email protected]
In-Reply-To: <[email protected]>
References: <[email protected]> <[email protected]>
This is a reply to your reply.
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输出结果