import re

#Write a program to find lines containing date from 1900 to 1999 in format '19XX r.' no matter what on the left or right of the expression.
#Note that part ' r.' is obligatory.
#Do use regular expressions.


def data_reg(file_path):
    with open(file_path, 'r', encoding='utf-8') as file:
        for line in file:
            if (re.search(".*19\d{2} r\..*", line)):
                print(line.strip())


file_path = 'TaskD03\simple.in'
data_reg(file_path)