regex.c

#include <pcre.h>

#define OVECCOUNT 90

pcre *SimpleCompileRegex(const char *pattern, char ** errmsg) {
  const char *error;
  int erroffset;
  pcre *re = pcre_compile(
    pattern,              /* the pattern */
    0,                    /* default options */
    &error,               /* for error message */
    &erroffset,           /* for error offset */
    NULL);
  if (re == NULL) {
    char *buf;
    size_t sz;
    sz = snprintf(NULL, 0, "PCRE compilation failed at offset %d: %s", erroffset, error);
    buf = (char *)malloc(sz + 1); /* make sure you check for != NULL in real code */
    snprintf(buf, sz+1, "PCRE compilation failed at offset %d: %s", erroffset, error);
    *errmsg = buf;
  }
  return re;
}

int CheckCompiledRegexOnString(pcre *regex, const char *str) {
  int subject_length = (int)strlen(str);
  int ovector[OVECCOUNT];
  int rc = pcre_exec(
    regex,                /* the compiled pattern */
    NULL,                 /* no extra data - we didn't study the pattern */
    str,              /* the subject string */
    subject_length,       /* the length of the subject */
    0,                    /* start at offset 0 in the subject */
    0,                    /* default options */
    ovector,              /* output vector for substring information */
    OVECCOUNT); /* number of elements in the output vector */
  // free(subject);
  // pcre_free(regex);     /* Release memory used for the compiled pattern */
  if (rc < 0)
    {
    // Some dtails about why it didn't match. See "Error return values from pcre_exec() in man pcreapi" (or line 1832)
    // switch(rc)
    //   {
    //   case PCRE_ERROR_NOMATCH: printf("No match\n"); break;
    //   /*
    //   Handle other special cases if you like
    //   */
    //   default: printf("Matching error %d\n", rc); break;
    //   }
    return rc;
  }
  return 1;
}