在STD :: string中搜索包含特殊字符的字符串（c ++） [英] search for a string containing special characters within a STD::string ( c++ )

问题描述

Heya



我从HTML请求中获得了一个长字符串。我需要找到以下子串：



<& randomtag>



但是当我我试图搜索它给我错误的结果。



如果我用一些东西替换字符串，不包含< > 中它完美无瑕。



相关代码：

（未复制，可能有一些拼写错误，但没有特殊字符）

Heya

I got a long string from a HTML request. I need to find the following substring within:

<&randomtag>

However when I''m trying to search it gives me wrong results.

If I replace the string with something, not containing "<" ">" it works flawlessly.

Relevant code:
(not copied, might have some typos, but works without special characters)

std::string readBuffer; //longlongstring
std::string starttag;
std::string endtag;

size_t sstart;
size_t send;

//...................

sstart=readBuffer.find(starttag);
send=redBuffer.find(endtag);

correction=readBuffer.substr(sstart,send-sstart);

std::cout << correction << std::endl;

所以是的，如果有人碰巧知道解决这个问题的方法，我会非常感激:)

提前致谢

So yeah, if anyone happens to know a way to fix this, I''d very much be greatful :)
Thanks in advance

推荐答案

1。你是什​​么意思 - 错误的结果？

2.我刚试图运行：

1. what do you mean- wrong result?
2. I just tried to run:

std::string readBuffer = "dgsdg sdfgsd sdfg ds <&randomtag> fghhsdfgsd dfgd sdg dfgdg dfg  ghdfh sdfg";
std::string starttag = "<&randomtag>";
std::string endtag = "";
 
size_t sstart;
size_t send;
 
//...................

sstart=readBuffer.find(starttag);
send=readBuffer.find(endtag);
 
std::string correction = readBuffer.substr(sstart,send-sstart);

和它按预期工作。更正变量持有<& randomtag> fghhsdfgsd dfgd sdg dfgdg dfg。

and it worked as expected. correction variable was holding "<&randomtag> fghhsdfgsd dfgd sdg dfgdg dfg ".

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