fix: Use raw strings for strings with \

Avoid DeprecationWarning which will turn into SyntaxError in later
Python versions

frappe/core/doctype/data_export/exporter.py

@@ -282,7 +282,7 @@ class DataExporter:
 				try:
 					sflags = self.docs_to_export.get("flags", "I,U").upper()
 					flags = 0
-					for a in re.split('\W+',sflags):
+					for a in re.split(r'\W+',sflags):
 						flags = flags | reflags.get(a,0)
 
 					c = re.compile(names, flags)

frappe/core/doctype/doctype/test_doctype.py

@@ -92,7 +92,7 @@ class TestDocType(unittest.TestCase):
 			fields=["parent", "depends_on", "collapsible_depends_on", "mandatory_depends_on",\
 				"read_only_depends_on", "fieldname", "fieldtype"])
 
-		pattern = """[\w\.:_]+\s*={1}\s*[\w\.@'"]+"""
+		pattern = r"""[\w\.:_]+\s*={1}\s*[\w\.@'"]+"""
 		for field in docfields:
 			for depends_on in ["depends_on", "collapsible_depends_on", "mandatory_depends_on", "read_only_depends_on"]:
 				condition = field.get(depends_on)

frappe/email/receive.py

@@ -284,7 +284,7 @@ class EmailServer:
 
 		flags = []
 		for flag in imaplib.ParseFlags(flag_string) or []:
-			pattern = re.compile("\w+")
+			pattern = re.compile(r"\w+")
 			match = re.search(pattern, frappe.as_unicode(flag))
 			flags.append(match.group(0))
 
@@ -555,7 +555,7 @@ class Email:
 
 	def get_thread_id(self):
 		"""Extract thread ID from `[]`"""
-		l = re.findall('(?<=\[)[\w/-]+', self.subject)
+		l = re.findall(r'(?<=\[)[\w/-]+', self.subject)
 		return l and l[0] or None
 
 

frappe/utils/boilerplate.py

@@ -42,7 +42,7 @@ def make_boilerplate(dest, app_name):
 			if hook_key=="app_name" and hook_val.lower().replace(" ", "_") != hook_val:
 				print("App Name must be all lowercase and without spaces")
 				hook_val = ""
-			elif hook_key=="app_title" and not re.match("^(?![\W])[^\d_\s][\w -]+$", hook_val, re.UNICODE):
+			elif hook_key=="app_title" and not re.match(r"^(?![\W])[^\d_\s][\w -]+$", hook_val, re.UNICODE):
 				print("App Title should start with a letter and it can only consist of letters, numbers, spaces and underscores")
 				hook_val = ""
 

frappe/utils/redis_wrapper.py

@@ -98,7 +98,7 @@ class RedisWrapper(redis.Redis):
 			return self.keys(key)
 
 		except redis.exceptions.ConnectionError:
-			regex = re.compile(cstr(key).replace("|", "\|").replace("*", "[\w]*"))
+			regex = re.compile(cstr(key).replace("|", r"\|").replace("*", r"[\w]*"))
 			return [k for k in list(frappe.local.cache) if regex.match(cstr(k))]
 
 	def delete_keys(self, key):