Allow W605 to be silenced by noqa

Author: asottile

pycodestyle.py

@@ -1509,12 +1509,15 @@ def python_3000_backticks(logical_line):
 
 
 @register_check
-def python_3000_invalid_escape_sequence(logical_line, tokens):
+def python_3000_invalid_escape_sequence(logical_line, tokens, noqa):
     r"""Invalid escape sequences are deprecated in Python 3.6.
 
     Okay: regex = r'\.png$'
     W605: regex = '\.png$'
     """
+    if noqa:
+        return
+
     # https://docs.python.org/3/reference/lexical_analysis.html#string-and-bytes-literals
     valid = [
         '\n',

testsuite/W60.py

@@ -40,6 +40,10 @@
 \\.png$
 '''
 s = '\\'
+regex = '\w'  # noqa
+regex = '''
+\w
+'''  # noqa
 #: W606
 async = 42
 #: W606