C++ regcomp Segmentation Fault

Question

I just call the function init_regex in main, got the segmentation fault, always in the fourth regcomp, I have tried to delete the other regex expression remains the first one, and replicate it four time but the problem still remains

enum {
  TK_NOTYPE = 256, TK_EQ,
  TK_NEQ, TK_AND, TK_OR, 
  TK_LARGE, TK_SMALL, TK_GE, TK_SE,
};

static struct rule {
  const char *regex;
  int token_type;
} rules[] = {
  {" +", TK_NOTYPE},            // spaces
  {"\n+", TK_NOTYPE},           // line feed
  {"\\+", '+'},                 // plus
  {"-", '-'},                   // minus
  {"\\*", '*'},                 // multiply or pointer
  {"/", '/'},                   // divide
  {"\\^", '^'},                 // power
  {"0x[a-f,0-9]+", 'x'},        // heximal with sign
  {"[0-9]+u", 'd'},             // unsigned decimal
  {"[0-9]+", 'd'},              // decimal
  {"\\$[a-z,0-9]{0,3}", 'r'},   // registers
  {"[a-z][a-z,-,0-9]*", 'v'},   // variable
  {"\\(", '('},                 // left bracket
  {"\\)", ')'},                 // right bracket
  {"\\[", '['},                 // left mid-size bracket
  {"\\]", ']'},                 // right mid-size bracket
  {"==", TK_EQ},                // equal
  {"!=", TK_NEQ},               // not equal
  {"&&", TK_AND},               // and
  {"||", TK_OR},                // or
  {">", TK_LARGE},              // larger
  {"<", TK_SMALL},              // small
  {">=", TK_GE},                // larger or equal
  {"<=", TK_SE},                // smaller or equal
};

#define NR_REGEX        (int)(sizeof(rules)/sizeof(rules[0]))

static regex_t re[NR_REGEX] = {};

void init_regex() {
    int i;
    char error_msg[128];
    int ret;

    printf("%d\n", NR_REGEX);
    printf("%ld\n", sizeof(re)/sizeof(re[0]));
    for (i = 0; i < NR_REGEX; i ++) {
        ret = regcomp(&re[i], rules[i].regex, REG_EXTENDED);
        if (ret != 0) {
            printf("YEAH\n");
            regerror(ret, &re[i], error_msg, 128);
            panic("regex compilation failed: %s\n%s", error_msg, rules[i].regex);
        }
    }
    printf("%d\n", i);
}