diff --git a/contrib/experiments/test_messaging.py b/contrib/experiments/test_messaging.py
index 3bbbcfa1b4..ac9079fe94 100644
--- a/contrib/experiments/test_messaging.py
+++ b/contrib/experiments/test_messaging.py
@@ -75,7 +75,7 @@ class InputOutput(object):
"""
try:
- m = re.match("^join (\S+)$", line)
+ m = re.match(r"^join (\S+)$", line)
if m:
# The `sender` wants to join a room.
(room_name,) = m.groups()
@@ -84,7 +84,7 @@ class InputOutput(object):
# self.print_line("OK.")
return
- m = re.match("^invite (\S+) (\S+)$", line)
+ m = re.match(r"^invite (\S+) (\S+)$", line)
if m:
# `sender` wants to invite someone to a room
room_name, invitee = m.groups()
@@ -93,7 +93,7 @@ class InputOutput(object):
# self.print_line("OK.")
return
- m = re.match("^send (\S+) (.*)$", line)
+ m = re.match(r"^send (\S+) (.*)$", line)
if m:
# `sender` wants to message a room
room_name, body = m.groups()
@@ -102,7 +102,7 @@ class InputOutput(object):
# self.print_line("OK.")
return
- m = re.match("^backfill (\S+)$", line)
+ m = re.match(r"^backfill (\S+)$", line)
if m:
# we want to backfill a room
(room_name,) = m.groups()
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