diff --git a/pre_commit/commands/autoupdate.py b/pre_commit/commands/autoupdate.py
index 19e82a06..fd98118a 100644
--- a/pre_commit/commands/autoupdate.py
+++ b/pre_commit/commands/autoupdate.py
@@ -121,10 +121,10 @@ def _write_new_config(path: str, rev_infos: List[Optional[RevInfo]]) -> None:
         new_rev = new_rev_s.split(':', 1)[1].strip()
         if rev_info.frozen is not None:
             comment = f'  # frozen: {rev_info.frozen}'
-        elif match.group(4).strip().startswith('# frozen:'):
+        elif match[4].strip().startswith('# frozen:'):
             comment = ''
         else:
-            comment = match.group(4)
+            comment = match[4]
         lines[idx] = f'{match[1]}rev:{match[2]}{new_rev}{comment}{match[5]}'
 
     with open(path, 'w') as f:
diff --git a/pre_commit/languages/pygrep.py b/pre_commit/languages/pygrep.py
index 9bdb8e11..06d91903 100644
--- a/pre_commit/languages/pygrep.py
+++ b/pre_commit/languages/pygrep.py
@@ -41,7 +41,7 @@ def _process_filename_at_once(pattern: Pattern[bytes], filename: str) -> int:
             line_no = contents[:match.start()].count(b'\n')
             output.write(f'{filename}:{line_no + 1}:')
 
-            matched_lines = match.group().split(b'\n')
+            matched_lines = match[0].split(b'\n')
             matched_lines[0] = contents.split(b'\n')[line_no]
 
             output.write_line(b'\n'.join(matched_lines))