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re.search solution in Clear category for Unix Match. Part 1 by vlad.bezden
"""Unix Match. Part 1
https://py.checkio.org/en/mission/unix-match-part-1/
Sometimes you find yourself in a situation when,
among a huge number of files on your computer or in a separate folder,
you need to find files of a certain type. For example,
images with the extension '.jpg' or documents with the extension '.txt',
or even files that have the word 'butterfly' in their name.
Doing this manually can be time-consuming. 'Matching' or patterns
for searching files by a specific mask are just what you
need for these sort of challenges.
This mission will help you understand how this works.
You need to find out if the given unix pattern matches the given filename.
Let me show you what I mean by matching the filenames in the unix-shell.
For example, * matches everything and *.txt matches all of the files that
have txt extension. Here is a small table that shows symbols that can
be used in patterns.
* matches everything
? matches any single character
Input: Two arguments. Both are strings.
Output: Bool.
Example:
unix_match('somefile.txt', '*') == True
unix_match('other.exe', '*') == True
unix_match('my.exe', '*.txt') == False
unix_match('log1.txt', 'log?.txt') == True
unix_match('log12.txt', 'log?.txt') == False
unix_match('log12.txt', 'log??.txt') == True
Precondition: 0 < len(strings) < 100
"""
from re import search
def unix_match(filename: str, pattern: str) -> bool:
return (
search(
pattern.replace(".", r"\.").replace("*", ".*").replace("?", "."), filename
)
is not None
)
if __name__ == "__main__":
assert unix_match("txt", "????*") is False
assert unix_match("somefile.txt", "*") is True
assert unix_match("other.exe", "*") is True
assert unix_match("my.exe", "*.txt") is False
assert unix_match("log1.txt", "log?.txt") is True
assert unix_match("log12.txt", "log?.txt") is False
assert unix_match("log12.txt", "log??.txt") is True
print("PASSED!!!")
Aug. 11, 2020
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