我想匹配升压一个简单的表达,但它的行为奇怪...下面的代码应匹配,并显示“A”从第一和第二串:boost xpressive:错误的匹配?
#include <iostream>
#include <boost/xpressive/xpressive.hpp>
#include "stdio.h"
using namespace boost::xpressive;
void xmatch_action(const char *line) {
cregex g_re_var;
cmatch what;
g_re_var = cregex::compile("\\s*var\\s+([\\w]+)\\s*=.*?");
if (regex_match(line, what, g_re_var)) {
printf("OK\n");
printf(">%s<\n", what[1]);
}
else {
printf("NOK\n");
}
}
int main()
{
xmatch_action("var a = qqq");
xmatch_action(" var a = aaa");
xmatch_action(" var abc ");
}
,但我实际的输出是:
OK
>a = qqq<
OK
>a = aaa<
NOK
,它应该是
OK
>a<
OK
>a<
NOK
小测试结果;那些都OK:'cout <<什么[1] << endl; printf(“%s \ n”,what [1] .str()。c_str()); printf(“%s \ n”,string(what [1])。c_str());'This is not:'printf(“%s \ n”,what [1]);'' –