diff --git a/nbdev/config.py b/nbdev/config.py
index bd01638b5..0c3c61ac1 100644
--- a/nbdev/config.py
+++ b/nbdev/config.py
@@ -222,7 +222,7 @@ def create_output(txt, mime):
 def show_src(src, lang='python'): return Markdown(f'```{lang}\n{src}\n```')
 
 # %% ../nbs/api/01_config.ipynb 48
-_re_version = re.compile('^__version__\s*=.*$', re.MULTILINE)
+_re_version = re.compile(r'^__version__\s*=.*$', re.MULTILINE)
 _init = '__init__.py'
 
 def update_version(path=None):
diff --git a/nbdev/doclinks.py b/nbdev/doclinks.py
index 9b3ed3d0c..97cd373f9 100644
--- a/nbdev/doclinks.py
+++ b/nbdev/doclinks.py
@@ -98,7 +98,7 @@ def _build_modidx(dest=None, nbs_path=None, skip_exists=False):
     res['settings'] = {k:v for k,v in get_config().d.items()
                        if k in ('doc_host','doc_baseurl','lib_path','git_url','branch')}
     code_root = dest.parent.resolve()
-    for file in globtastic(dest, file_glob="*.py", skip_file_re='^_', skip_folder_re="\.ipynb_checkpoints"):
+    for file in globtastic(dest, file_glob="*.py", skip_file_re='^_', skip_folder_re=r"\.ipynb_checkpoints"):
         res['syms'].update(_get_modidx((dest.parent/file).resolve(), code_root, nbs_path=nbs_path))
     idxfile.write_text("# Autogenerated by nbdev\n\nd = "+pformat(res, width=140, indent=2, compact=True)+'\n')
 
diff --git a/nbdev/quarto.py b/nbdev/quarto.py
index ea71ded34..db0f44a45 100644
--- a/nbdev/quarto.py
+++ b/nbdev/quarto.py
@@ -68,7 +68,7 @@ def _sort(a):
     if y.startswith('index.'): return x,'00'
     return a
 #|export
-_def_file_re = '\.(?:ipynb|qmd|html)$'
+_def_file_re = r'\.(?:ipynb|qmd|html)$'
 
 @delegates(nbglob_cli)
 def _nbglob_docs(
@@ -87,12 +87,12 @@ def _recursive_parser(
         set_index: bool = True): # If `True`, `index` file will be set to href.
     for name, val in dir_dict.items():
         if type(val) is str:
-            if re.search('index\..*', re.sub('^\d+_', '', val)) and set_index and section:
+            if re.search('index\..*', re.sub(r'^\d+_', '', val)) and set_index and section:
                 section.update({'href': str(dirpath/val)})
             else:
                 contents.append(str(dirpath/val))
         elif type(val) is dict:
-            name = re.sub('^\d+_', '', name)
+            name = re.sub(r'^\d+_', '', name)
             section = {'section': name, 'contents': []}
             contents.append(section)
             _recursive_parser(val, section['contents'], dirpath/name, section=section)
diff --git a/nbdev/showdoc.py b/nbdev/showdoc.py
index c37925b3b..7442d9a62 100644
--- a/nbdev/showdoc.py
+++ b/nbdev/showdoc.py
@@ -25,7 +25,7 @@ def _bold(s): return f'**{s}**' if s.strip() else s
 
 # %% ../nbs/api/08_showdoc.ipynb 7
 def _escape_markdown(s):
-    for c in '|^': s = re.sub(rf'\\?\{c}', f'\{c}', s)
+    for c in '|^': s = re.sub(rf'\\?\{c}', rf'\{c}', s)
     return s.replace('\n', '<br>')
 
 # %% ../nbs/api/08_showdoc.ipynb 9
diff --git a/nbdev/sync.py b/nbdev/sync.py
index 14a87226a..95cb7a346 100644
--- a/nbdev/sync.py
+++ b/nbdev/sync.py
@@ -34,7 +34,7 @@ def _mod_files():
     return L(files for mod in midx.d['syms'].values() for _,files in mod.values()).unique()
 
 # %% ../nbs/api/06_sync.ipynb 8
-_re_import = re.compile("from\s+\S+\s+import\s+\S")
+_re_import = re.compile(r"from\s+\S+\s+import\s+\S")
 
 # %% ../nbs/api/06_sync.ipynb 10
 def _to_absolute(code, py_path, lib_dir):
diff --git a/nbs/api/01_config.ipynb b/nbs/api/01_config.ipynb
index 2157ed385..6da2b94b5 100644
--- a/nbs/api/01_config.ipynb
+++ b/nbs/api/01_config.ipynb
@@ -682,7 +682,7 @@
    "outputs": [],
    "source": [
     "#|export\n",
-    "_re_version = re.compile('^__version__\\s*=.*$', re.MULTILINE)\n",
+    "_re_version = re.compile(r'^__version__\\s*=.*$', re.MULTILINE)\n",
     "_init = '__init__.py'\n",
     "\n",
     "def update_version(path=None):\n",
diff --git a/nbs/api/05_doclinks.ipynb b/nbs/api/05_doclinks.ipynb
index c9d7ea037..5f9946292 100644
--- a/nbs/api/05_doclinks.ipynb
+++ b/nbs/api/05_doclinks.ipynb
@@ -239,7 +239,7 @@
     "    res['settings'] = {k:v for k,v in get_config().d.items()\n",
     "                       if k in ('doc_host','doc_baseurl','lib_path','git_url','branch')}\n",
     "    code_root = dest.parent.resolve()\n",
-    "    for file in globtastic(dest, file_glob=\"*.py\", skip_file_re='^_', skip_folder_re=\"\\.ipynb_checkpoints\"):\n",
+    "    for file in globtastic(dest, file_glob=\"*.py\", skip_file_re='^_', skip_folder_re=r\"\\.ipynb_checkpoints\"):\n",
     "        res['syms'].update(_get_modidx((dest.parent/file).resolve(), code_root, nbs_path=nbs_path))\n",
     "    idxfile.write_text(\"# Autogenerated by nbdev\\n\\nd = \"+pformat(res, width=140, indent=2, compact=True)+'\\n')"
    ]
diff --git a/nbs/api/06_sync.ipynb b/nbs/api/06_sync.ipynb
index e77b2712e..627b78425 100644
--- a/nbs/api/06_sync.ipynb
+++ b/nbs/api/06_sync.ipynb
@@ -109,7 +109,7 @@
    "outputs": [],
    "source": [
     "#|export\n",
-    "_re_import = re.compile(\"from\\s+\\S+\\s+import\\s+\\S\")"
+    "_re_import = re.compile(r\"from\\s+\\S+\\s+import\\s+\\S\")"
    ]
   },
   {
diff --git a/nbs/api/08_showdoc.ipynb b/nbs/api/08_showdoc.ipynb
index c1a62ec9b..76452eea0 100644
--- a/nbs/api/08_showdoc.ipynb
+++ b/nbs/api/08_showdoc.ipynb
@@ -92,7 +92,7 @@
    "source": [
     "#|export\n",
     "def _escape_markdown(s):\n",
-    "    for c in '|^': s = re.sub(rf'\\\\?\\{c}', f'\\{c}', s)\n",
+    "    for c in '|^': s = re.sub(rf'\\\\?\\{c}', rf'\\{c}', s)\n",
     "    return s.replace('\\n', '<br>')"
    ]
   },
diff --git a/nbs/api/14_quarto.ipynb b/nbs/api/14_quarto.ipynb
index b8a4e9fab..f327bfed7 100644
--- a/nbs/api/14_quarto.ipynb
+++ b/nbs/api/14_quarto.ipynb
@@ -159,7 +159,7 @@
     "    if y.startswith('index.'): return x,'00'\n",
     "    return a\n",
     "#|export\n",
-    "_def_file_re = '\\.(?:ipynb|qmd|html)$'\n",
+    "_def_file_re = r'\\.(?:ipynb|qmd|html)$'\n",
     "\n",
     "@delegates(nbglob_cli)\n",
     "def _nbglob_docs(\n",
@@ -186,12 +186,12 @@
     "        set_index: bool = True): # If `True`, `index` file will be set to href.\n",
     "    for name, val in dir_dict.items():\n",
     "        if type(val) is str:\n",
-    "            if re.search('index\\..*', re.sub('^\\d+_', '', val)) and set_index and section:\n",
+    "            if re.search('index\\..*', re.sub(r'^\\d+_', '', val)) and set_index and section:\n",
     "                section.update({'href': str(dirpath/val)})\n",
     "            else:\n",
     "                contents.append(str(dirpath/val))\n",
     "        elif type(val) is dict:\n",
-    "            name = re.sub('^\\d+_', '', name)\n",
+    "            name = re.sub(r'^\\d+_', '', name)\n",
     "            section = {'section': name, 'contents': []}\n",
     "            contents.append(section)\n",
     "            _recursive_parser(val, section['contents'], dirpath/name, section=section)\n",