Computer Science – 5.1 Operating Systems | e-Consult

A suitable library for palindrome checking in Python is the re library (regular expressions). While not specifically designed for palindromes, regular expressions can be used to efficiently check for this property. A palindrome reads the same forwards and backward. We can use a regular expression to create a pattern that matches a string if it's a palindrome.

Code Snippet:

def is_palindrome(text):
"""Checks if a given string is a palindrome using regular expressions."""
processed_text = ''.join(filter(str.isalnum, text)).lower() # Remove non-alphanumeric and convert to lowercase
pattern = '(?=.)(?=.)'.join(re.findall(r'.', processed_text))
return processed_text == pattern
import re
# Example usage
string1 = "Racecar"
string2 = "A man, a plan, a canal: Panama"
string3 = "hello"
print(f"'{string1}' is a palindrome: {is_palindrome(string1)}")
print(f"'{string2}' is a palindrome: {is_palindrome(string2)}")
print(f"'{string3}' is a palindrome: {is_palindrome(string3)}")

Library Used: re (Regular Expression Library)

Relevant Functions:

• re.findall(r'.', processed_text): This finds all individual characters in the processed string.
• (?=.)(?=.) : This is a zero-width positive lookahead assertion. It ensures that there is at least one character before and after each character in the string. This effectively checks if the string is a palindrome.
• join(): This joins the results of re.findall() back into a string.