Regex FTW clear solution for Count Substring Occurrences by H0r4c3 - python coding challenges

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Regex FTW solution in Clear category for Count Substring Occurrences by H0r4c3

import re

def count_occurrences(main_str: str, sub_str: str) -> int:
    matches = re.finditer(f'(?=({sub_str.lower()}))', main_str.lower())
    result = [match.group(1) for match in matches]
    print(result)
    
    return len(result)


print("Example:")
print(count_occurrences("hello world hello", "hello"))

# These "asserts" are used for self-checking
assert count_occurrences("hello world hello", "hello") == 2
assert count_occurrences("Hello World hello", "hello") == 2
assert count_occurrences("hello", "world") == 0
assert count_occurrences("hello world hello world hello", "world") == 2
assert count_occurrences("HELLO", "hello") == 1
assert count_occurrences("appleappleapple", "appleapple") == 2
assert count_occurrences("HELLO WORLD", "WORLD") == 1
assert count_occurrences("hello world hello", "o w") == 1
assert count_occurrences("apple apple apple", "apple") == 3
assert count_occurrences("apple Apple apple", "apple") == 3
assert count_occurrences("apple", "APPLE") == 1

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Feb. 4, 2024

Strings and Integers

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