Python program to find files having a particular extension using RegEx
Last Updated :
29 Dec, 2020
Prerequisite: Regular Expression in Python
Many of the times we need to search for a particular type of file from a list of different types of files. And we can do so with only a few lines of code using python. And the cool part is we don’t need to install any external package, python has a built-in package called re, with which we can easily write the program for performing this task.
Approach:
- This program searches for the files having “.xml” extension from a list of different files.
- Make a regular expression/pattern : “\.xml$”
- Here re.search() function is used to check for a match anywhere in the string (name of the file). It basically returns the match object when the pattern is found and if the pattern is not found it returns null.
- The functionality of different Metacharacters used here:
- \ It is used to specify a special meaning of character after it. It is also used to escape special characters.
- $ The string ends with the pattern which is before it.
- Here “.xml” pattern is searched and processed.
Below is the implementation:
Python3
import re
filenames = ["gfg.html", "geeks.xml",
"computer.txt", "geeksforgeeks.jpg"]
for file in filenames:
match = re.search("\.xml$", file)
if match:
print("The file ending with .xml is:",
file)
|
Output:
The file ending with .xml is: geeks.xml
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