code: public function filter($relativePath, $exclude)
      {
          foreach ($this->excludePatterns as $patternData) {
              list($pattern, $negate, $stripLeadingSlash) = $patternData;
  
              if ($stripLeadingSlash) {
                  $path = substr($relativePath, 1);
              } else {
                  $path = $relativePath;
              }
  
              if (preg_match($pattern, $path)) {
                  $exclude = !$negate;
              }
          }
  
          return $exclude;
      }
docs: Checks the given path against all exclude patterns in this filter
  
  Negated patterns overwrite exclude decisions of previous filters.
  
  @param string $relativePath The file's path relative to the sourcePath
  @param bool   $exclude      Whether a previous filter wants to exclude this file
  
  @return bool Whether the file should be excluded