Question: 
Write a function to convert a date of yyyy-mm-dd format to dd-mm-yyyy format by using regex.


Model's Code:
import re

def change_date_format(date_str):
    return re.sub(r"(\d{4})-(\d{2})-(\d{2})", r"\3-\2-\1", date_str)



Sample Correct Code:
import re
def change_date_format(dt):
        return re.sub(r'(\d{4})-(\d{1,2})-(\d{1,2})', '\\3-\\2-\\1', dt)


Asserts:
assert change_date_format("2026-01-02") == '02-01-2026'
assert change_date_format("2020-11-13") == '13-11-2020'
assert change_date_format("2021-04-26") == '26-04-2021'


Tests:
Test 1 of 3: PASS
Test 2 of 3: PASS
Test 3 of 3: PASS

Test 427 of 974: 312/427 (73.06791569086651%): success