[英]Is symbol ’ special one for boost regexp?
Regular expression: “[^”]*“
正则表达式:
“[^”]*“
String: “lips“
字符串:
“lips“
Result: match结果:匹配
String: “lips'“
字符串:
“lips'“
Result: not match结果:不匹配
I expect both strings to match.我希望两个字符串都匹配。
C++ code: C++ 代码:
#include <iostream>
#include <string>
#include <boost/regex.hpp>
using namespace std;
using namespace boost;
int main()
{
const string s1 = "“lips“";
const string s2 = "“lips’“";
if (regex_search(s1, regex("“[^”]*“"))) cout << "s1 matched" << endl;
if (regex_search(s2, regex("“[^”]*“"))) cout << "s2 matched" << endl;
return 0;
}
output: s1 matched output:s1 匹配
Is the symbol '
special?符号
'
特殊吗? Why is the second string not matching?为什么第二个字符串不匹配?
boost regex library does not use utf-8 by default. boost 正则表达式库默认不使用 utf-8。 utf-8 quote symbol and apostrophe have common byte, that`s why regex does not work.
utf-8 引号和撇号有共同的字节,这就是正则表达式不起作用的原因。 Code for utf-8:
utf-8 的代码:
#include <iostream>
#include <string>
#include <boost/regex.hpp>
#include <boost/regex/icu.hpp>
using namespace std;
using namespace boost;
int main()
{
const string s1 = "“lips“";
const string s2 = "“lips’“";
if (u32regex_search(s1, make_u32regex("“[^”]*“"))) cout << "s1 matched" << endl;
if (u32regex_search(s2, make_u32regex("“[^”]*“"))) cout << "s2 matched" << endl;
return 0;
}
compilation: g++ -std=c++11./test.cc -licuuc -lboost_regex
编译:
g++ -std=c++11./test.cc -licuuc -lboost_regex
output: output:
s1 matched
s2 matched
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