我正在使用|
作为替代品,但它不起作用。我做错了吗?
谢谢!
以下代码始终返回No match
:
#include <sys/types.h>
#include <regex.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
int main(int argc, char *argv[]){
regex_t regex;
int reti;
char msgbuf[100];
/* Compile regular expression */
reti = regcomp(®ex, "ab(c|d)", 0);
if( reti ){ fprintf(stderr, "Could not compile regex\n"); exit(1); }
/* Execute regular expression */
reti = regexec(®ex, "abd", 0, NULL, 0);
if( !reti ){
puts("Match");
}
else if( reti == REG_NOMATCH ){
puts("No match");
}
else{
regerror(reti, ®ex, msgbuf, sizeof(msgbuf));
fprintf(stderr, "Regex match failed: %s\n", msgbuf);
exit(1);
}
/* Free compiled regular expression if you want to use the regex_t again */
regfree(®ex);
return 0;
}
答案 0 :(得分:7)
正如POSIX manual所说,你需要设置flags参数以允许扩展的正则表达式。
REG_EXTENDED Use POSIX Extended Regular Expression syntax when interpreting regex. If not set, POSIX Basic Regular Expression syntax is used.