docs: function regex(replacements) {
      return {
          name: 'regex',
  
          renderChunk(code) {
              const magicString = new MagicString(code);
              let hasReplacements = false;
  
              replacements.forEach(replacement => {
                  let [find, replace = ''] = replacement;
                  if (typeof find === 'string') find = new RegExp(find);
                  if (!find.global) find = new RegExp(find.source, 'g' + String(find).split('/').pop());
  
                  let match, start, end;
                  while ((match = find.exec(code))) {
                      hasReplacements = true;
  
                      start = match.index;
                      end = start + match[0].length;
  
                      magicString.overwrite(start, end, typeof replace === 'function' ? replace.apply(null, match) || '' : replace.replace(/\$(\d+)/, (str, index) => match[index]));
                  }
              });
  
              if (!hasReplacements) return null;
  
              return {
                  code: magicString.toString(),
                  map: magicString.generateMap({ hires: true })
              };
          }
      };
  }