Use raw string to fix SyntaxWarning

Author: remlapmot

nbs/04_code_utils.ipynb

@@ -850,7 +850,7 @@
     "    code = _replace_delimiter(code, sc_delimiter) \n",
     "    \n",
     "    # Replace multiple interior whitespace with one\n",
-    "    code = multi_regex.sub('\\g<char> ',code)\n",
+    "    code = multi_regex.sub(r'\\g<char> ',code)\n",
     "    \n",
     "    # Delete blank lines and whitespace at end of lines\n",
     "    code_lines = code.splitlines()\n",

nbstata/code_utils.py

@@ -118,7 +118,7 @@ def standardize_code(code, sc_delimiter=False):
     code = _replace_delimiter(code, sc_delimiter) 
 
     # Replace multiple interior whitespace with one
-    code = multi_regex.sub('\g<char> ',code)
+    code = multi_regex.sub(r'\g<char> ',code)
 
     # Delete blank lines and whitespace at end of lines
     code_lines = code.splitlines()