1 files changed, 1 insertions, 1 deletions
diff --git a/pep8.py b/pep8.py
index 7a50ab3..338b434 100755
--- a/pep8.py
+++ b/pep8.py
@@ -108,7 +108,7 @@ EXTRANEOUS_WHITESPACE_REGEX = re.compile(r'[[({] | []}),;:]')
 WHITESPACE_AFTER_COMMA_REGEX = re.compile(r'[,;:]\s*(?:  |\t)')
 COMPARE_SINGLETON_REGEX = re.compile(r'\b(None|False|True)?\s*([=!]=)'
                                      r'\s*(?(1)|(None|False|True))\b')
-COMPARE_NEGATIVE_REGEX = re.compile(r'\b(not)\s+[^[({ ]+\s+(in|is)\s')
+COMPARE_NEGATIVE_REGEX = re.compile(r'\b(not)\s+[^][)(}{ ]+\s+(in|is)\s')
 COMPARE_TYPE_REGEX = re.compile(r'(?:[=!]=|is(?:\s+not)?)\s*type(?:s.\w+Type'
                                 r'|\s*\(\s*([^)]*[^ )])\s*\))')
 KEYWORD_REGEX = re.compile(r'(\s*)\b(?:%s)\b(\s*)' % r'|'.join(KEYWORDS))