环境:
centos
c++
匹配情况分类
1 字符串完全匹配 compare
2 字符串匹配到起始位置
3 字符串匹配到末尾位置
4 字符串匹配在中间位置
5 字符串未能匹配到
code
#include <iostream>
#include <string>
int main()
{
string str = "abcdef中国汽车";
string t = "bc";
pos = str.find(t);
if(!str.compare(t))
{
std::cout << "1 str is equal to t" << std::endl;
}
else if(pos == 0)
{
std::cout << "2 t is match at the begin of str" << std::endl;
}
else if(pos + t.length() == str.length())
{
std::cout << "3 t is match at the begin of str" << std::endl;
}
else if(pos != string::npos)
{
std::cout << "4 t is match at the middle of str" << std::endl;
}
else
{
std::cout << "5 t is not matched in str" << std::endl;
}
return 0;
}
补充说明
1 对于完全匹配
除了上面的code中实例外还可以判断条件
if(pos==0 && pos + t.length() == str.length() )
{
std::cout << "1 str is equal to t" << std::endl;
}
2 对于中间位置匹配
基于前面的 3 种条件过滤,4种判断条件也可以改为
if(pos > 0 && pos < str.length())
{
std::cout << "4 t is match at the middle of str" << std::endl;
}