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First solution in Clear category for Count Substring Occurrences by mortonfox
def count_occurrences(main_str: str, sub_str: str) -> int:
main_str = main_str.lower()
sub_str = sub_str.lower()
count = p = 0
while True:
p2 = main_str.find(sub_str, p)
if p2 < 0: break
count += 1
p = p2 + 1
return count
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("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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Oct. 11, 2023
