c_cpp c ++中的简单匹配字符串与正则表达式只支持“*”和“？”通配符

Posted 2021-05-14

// GLOG Implementation
// Implementation of fnmatch that does not need 0-termination
// of arguments and does not allocate any memory,
// but we only support "*" and "?" wildcards, not the "[...]" patterns.
// It's not a static function for the unittest.
GOOGLE_GLOG_DLL_DECL bool SafeFNMatch_(const char* pattern,
                                       size_t patt_len,
                                       const char* str,
                                       size_t str_len) {
  size_t p = 0;
  size_t s = 0;
  while (1) {
    if (p == patt_len  &&  s == str_len) return true;
    if (p == patt_len) return false;
    if (s == str_len) return p+1 == patt_len  &&  pattern[p] == '*';
    if (pattern[p] == str[s]  ||  pattern[p] == '?') {
      p += 1;
      s += 1;
      continue;
    }
    if (pattern[p] == '*') {
      if (p+1 == patt_len) return true;
      do {
        if (SafeFNMatch_(pattern+(p+1), patt_len-(p+1), str+s, str_len-s)) {
          return true;
        }
        s += 1;
      } while (s != str_len);
      return false;
    }
    return false;
  }
}

// EasyLogging implementation
/// @brief Matches wildcards, '*' and '?' only supported.
static bool wildCardMatch(const char* str, const char* pattern) {
	while (*pattern) {
		switch (*pattern) {
		case '?':
			if (!*str)
				return false;
			++str;
			++pattern;
			break;
		case '*':
			if (wildCardMatch(str, pattern + 1))
				return true;
			if (*str && wildCardMatch(str + 1, pattern))
				return true;
			return false;
			break;
		default:
			if (*str++ != *pattern++)
				return false;
			break;
		}
	}
	return !*str && !*pattern;
}