import re

def validDate(date_string: str) -> bool:

"""

Validates stringtype dates of type `dd/mm/yyyy`, `dd-mm-yyyy` or `dd.mm.yyyy` from

years 1900-9999. Leap year support included.

Parameters

----------

date_string : str

Date to be validated

Returns

----------

boolean

Whether the date is valid or not

Examples

---------

>>> validDate("11/02/1996")

True

>>> validDate("29/02/2016")

True

>>> validDate("43/01/1996")

False

"""

# Let TypeError be.

# This regex string will validate dates of type `dd/mm/yyyy`, `dd-mm-yyyy` or `dd.mm.yyyy`

# from years 1900 - 2049. Leap year support included. Original Regex string based on

# https://stackoverflow.com/questions/15491894/regex-to-validate-date-format-dd-mm-yyyy

# modified to confine the year dates.

if re.match(

r"^(?:(?:31(\/|-|\.)(?:0?[13578]|1[02]))\1"

+ r"|(?:(?:29|30)(\/|-|\.)(?:0?[13-9]|1[0-2])\2"

+ r"))(?:(?:1[9]..|2[0][0-4].))$|^(?:29(\/|-|\.)0?2\3"

+ r"(?:(?:(?:1[6-9]|[2-9]\d)?(?:0[48]|[2468][048]|[13579][26])|(?:(?:16|[2468][048]"

+ r"|[3579][26])00))))$|^(?:0?[1-9]|1\d|2[0-8])(\/|-|\.)(?:(?:0?[1-9])|(?:1[0-2]))\4"

+ r"(?:(?:1[9]..|2[0][0-4].))$",

date_string,

flags=0,

):

return True

else:

return False