#### Problem description https://github.com/pandas-dev/pandas/blob/master/doc/cheatsheet/Pandas_Cheat_Sheet.pdf In Pandas_Cheat_Sheet/ Subset Variables (Columns)/ regex (Regular Expressions) Examples #### ''^(?!Species$).*' Matches strings except the string 'Species' The second ' in regex is unnecessary. #### Expected Output execute sucessfully #### Actual result: ```python # features = data_df.filter(regex=''^(?!SalePrice$).*') ``` File "<ipython-input-168-4e3c4f16b4c5>", line 5 features = data_df.filter(regex=''^(?!SalePrice$).*') ^ SyntaxError: invalid syntax #### should be: ```python # features = data_df.filter(regex='^(?!SalePrice$).*') ```