For some time now I stopped doing katas on codewars. So I have decided I will train now every week regularly. This kata is mainly about regular expressions which I knows pretty well.
You have to extract a portion of the file name as follows:
- Assume it will start with date represented as long number
- Followed by an underscore
- Youll have then a filename with an extension
- it will always have an extra extension at the end
1231231223123131_FILE_NAME.EXTENSION.OTHEREXTENSION 1_This_is_an_otherExample.mpg.OTHEREXTENSIONadasdassdassds34 1231231223123131_myFile.tar.gz2/pre>
FILE_NAME.EXTENSION This_is_an_otherExample.mpg myFile.tar
The recommend way to solve it is using RegEx and specifically groups.
import re class FileNameExtractor: def extract_file_name(dirty_file_name): return re.search('^\d+_(.*)\..*$', dirty_file_name).group(1)