Method capture

plugins/cachekey/pattern.cc:231–263

* @brief Return all PCRE capture groups that matched in the subject string * @param subject PCRE subject string * @param result reference to vector of strings containing all capture groups */

 * @param result reference to vector of strings containing all capture groups
 */
bool
Pattern::capture(const String &subject, StringVector &result)
{
  int matchCount;
  int ovector[OVECOUNT];

  CacheKeyDebug("capturing '%s' from '%s'", _pattern.c_str(), subject.c_str());

  if (!_re) {
    CacheKeyError("regular expression not initialized");
    return false;
  }

  matchCount = pcre_exec(_re, nullptr, subject.c_str(), subject.length(), 0, PCRE_NOTEMPTY, ovector, OVECOUNT);
  if (matchCount < 0) {
    if (matchCount != PCRE_ERROR_NOMATCH) {
      CacheKeyError("matching error %d", matchCount);
    }
    return false;
  }

  for (int i = 0; i < matchCount; i++) {
    int start  = ovector[2 * i];
    int length = ovector[2 * i + 1] - ovector[2 * i];

    String dst(subject, start, length);

    CacheKeyDebug("capturing '%s' %d[%d,%d]", dst.c_str(), i, ovector[2 * i], ovector[2 * i + 1]);
    result.push_back(dst);
  }

  return true;
}

/**
 * @brief Replaces all replacements found in the replacement string with what matched in the PCRE capturing groups.