message: Fix index for hex escape
diff: @@ -226,7 +226,7 @@ export const createRegExpParser = createParser((ParserCore) =>
  case 'x':
  {
  - const possibleHex = input.slice(get0(index) + 1, 2);
  + const possibleHex = input.slice(get0(index) + 1, get0(index) + 3);
  // \xhh
  if (possibleHex.length === 2 && isHex(possibleHex)) {
  